im thinking about making my own farm map but have never done so before, other than the modding wiki guides do you have anything that might help? or tips? (also, putting all my ideas into one coherent design is haard lol)
Hi anon! I'm glad you asked this question. This is going to be a VERY long answer so bear with me!
To me, making farm maps is a balance between one's technical skills (mastering how a map works, like map properties, location data, etc.) and aesthetic skills (your eye for design; basically how to make your map look good).
You can be good at making a map work in game but people don't find it aesthetically pleasing, or vice versa. Both have their own niches - me personally, I would never use one of those really big, empty maps, but people whose goal is to earn as much as possible would - but it's always good to be able to strike a balance.
Reading through the modding wiki will only help you so far in making maps. It will help you on the coding aspect, to load your map in game and make it function - but it won't help you on the aesthetic aspect. You have to study and practice for that. Find farm maps you consider aesthetically pleasing. Dissect them. Inspect the elements that you like to see. It could be how the cliffs are done, the shape of the rivers, etc. Download the map and open the files in Tiled, see what tiles are used to build which element.
The new 1.6 outdoor tiles (spring_outdoorsTileSheet2.png) has the 2-tile height cliff faces and water-dirt border tiles that works wonders for making natural terrain and river bends/pond shapes. I've gotten a LOT of mileage from those tiles!
(On a more personal note, I've been helpfully informed that in literally every game I play that has building elements, I become a full-time builder. Let's just say I have 'work experience' through building in Sims 4, and way before that, experimenting with parallax maps in RPG Maker VX Ace. Those are very different things in terms of technical aspects, but it definitely improved my eye for design.)
As for putting your ideas together - I find the easiest way is to start from a list. Before making my maps I think of what the basic concept for the map is, then what features I want to add, and work from there. For example, here are the earliest sketches for Blossom Crest:
You can see that I emphasized the planning mainly on terrain shape, feature elements (the suspension bridge), the gameplay elements (minecarts in), and the position of farm map features (e.g. grandpa's shrine). Only after I have determined these will I start adding terrain details, and I trust where the process takes me!
I highly recommend developing a structured workflow as well. When I worked on Meadowbrook Falls, I fucked myself over because I keep jumping from part to part on the map, and worked on all map layers on each individual section instead of one layer on the map as a whole before moving on to the next. Now, my priority after finishing the sketch is to lay down all terrain shapes on the Buildings layer, then filling in the water/dirt/grass parts, then terrain detailing (adding paths, dark grass patches, etc.), then decorating (deco bushes and trees, etc.), and finally the Paths layer (debris spawns, berry bushes, etc.).
TL;DR: Read up on the modding wiki to get you started on the technical aspects of map-making, dissect other people's creations to improve your aesthetic skills. Develop a structured workflow to make sure the creation process goes as smoothly as possible, and to minimize having to redo parts of the map in case of errors.
Additionally, you should consider joining the Stardew Valley Discord if you haven't, anon! There are plenty of people who'd be happy to guide you and give more tips in the #making-mods-general and #making-mods-art channels, including myself! I hope this answer helps you! π§‘