#umh...

First suggestion is to get a good, reliable art program. 

Plenty of artists use Paint Tool SAI and Clip Studio Paint (currently using CSP myself and don’t plan to ever abandon it). Neither of them is free but both are less pricey than Adobe bundles and both were created more for illustrating than “photoshopping” purposes. There’s plenty more but those are two I used and can recommend. Many art programs usually offer a 30 days trial so my suggestion would be to try them out and see which is more to your liking and offers the best quality/price wise.  

By personal experience, it’s much better to pay and have support than to find a free unofficial version and then get fucked and lose all your works when you update your operating system and discover the bootleg program doesn’t work anymore. Learn from me, don’t risk it.     

Next suggestion, get a drawing tablet or a tablet. Nothing too pricey as a beginner, when paired with a good program any decent tablet will do its job. What you really need is pen pressure, everything else is optional. People draw on their iPads with great results but never having tried I can’t give suggestions here, if not to look for artist who do and see how they work (YT surely has tutorials ‘bout it).   

With hardware and software out of the way, let’s get down to proper drawing business:  

First of all, forget that “but you’re not a real artist if you use references/copy poses” noise: use references, use all the references you want. 

If you want to paint a starry sky and don’t know how to rend the effect, maybe the glowing of a nebula? Look up Youtube and Deviantart tutorials, tumblr tutorials, look up on how all the artist you like paint and their tips, all the IRL photos in google. 

Something I personally find very helpful are tutorials comparing realistic and stylized styles and showing how to go from one to another, how to simplify shapes etc.    

Renaissance artist invented the darkroom/camera oscura to help them drawing perspective and then traced over that shit. If Caravaggio traced to save time, then so can we. 

And there’s so many different ways to reach a similar result that maybe your first attempts will look like copycats of that tutorial you saw or that really inspiring artist. It’s fine. But the more attempts and the more you play with your program of choice, brushes you like/find more comfortable, the more you look up different sources and integrate bits of them all in a singular piece, the more your work will be distinct.

Now, onto one of the big elephants in the room: do you know how to correctly sketch a human body from scratch? If yes, amazing! (all my respect). 

If not, there’s plenty of solutions without having to learn how to (which is the way I currently work bc drawing is a 100% hobby and I’d rather spend my time elsewhere than in re-learning human anatomy) and working digitally makes these solutions way easier. 

After you find a “how to draw anatomy” book or blog or tutorials and safely store it somewhere safe to go back and reference, then you can 

1. find stock photos, either from google (be careful not to use copyrighted stuff) or in bundles specifically created for artists to use as bases or references. On Deviantart for example there’s SenshiStock, incredible project with hundreds of photos free to use. The anatomy book/blog here will be useful if you want a certain body shape and your reference doesn’t match with your idea. 

2. chose a program like CSP or similar that comes with 3D stock poses which you can then alter as much as you like in size, weight, rotation, light direction, position of every body part down to each finger (in CSP’s case, you can also download plenty more free to use poses, brushes, 3d objects, patterns etc created by the userbase and shared in the library bundled with the program).  

3. if your main art program doesn’t come with human poses? no problem at all, get one just for this specific purpose, like Design Doll (both free/pay ver, imo free ver is more than enough), Posemaniacs (free, online, uses flash), MagicPoser (free with option of in-app purchases, it’s an app, good reviews, just tried it a little and seems quite good). 

4. less conventional but imo still useful, especially if you want to draw in “anime” style and proportions for Servants designs: go to My figure collections and use figmas. 

They’re highly posable plastic figures from the most different jp (and not) characters, each one with a photo gallery and as long as you modify the final piece and -important!- don’t sell it if you base it on a specific user photo? I’d say go for it. Or mix body parts of different figmas, or use the “archetype” products, naked bodies made precisely for drawing bases, there’s options with both more “anime” and more realistic proportion. 

I collect them for both owning Fate/other characters without spending a fortune and for drawing references and I find them quite well suited for this purpose. Why on earth despair if I’d ever want to draw Arturia in armor when I can just grab my figma of her, pose it, take a photo and then draw on it? :P

Now, hardware and software check, way to find poses check, what else? 

Layers are your best friends. For example, Bradamante? A good 50+ layers, some of them stored in folders so I could just select and deselect them to remove or put on mantle, lance, shield, sword etc. Just... remember to name them to save yourself a lot of time.  

And changing a layer’s opacity too, especially to draw the definitive lineart over the first rough sketch or for shading or highlights.