Lover, Fighter, Human!

I've decided the year 2019 is going to be a year of doing instead of dreaming. Photography has been a hobby of mine for a long time now and I've applied for a photography course. I'm no expert or even experienced beyond personal enjoyment. They want me to bring a portfolio of 6 to 12 photos. I don't know how to do a portfolio, how to lay them out or anything. I have decided on a theme, nature as I go on hikes a lot and always snap photos. But if there is anyone out there that can help me I would appreciate it so much! I really want to prove myself obviously I know they are not expecting professional results but I want them to look at my work and see how serious I am about this. So again any type of help would be great and I would be so thankful.