Are you any good at drawing? We start by drawing the items we like and then depends what we draw what code we use to convert it to a game file.
When I started back in 2015 I said I couldn't draw, but several members of the form keep pushing me and a few months of practice I started to win.
Many coders will allow you to use their source. I started using buildings from FIRS, CHIPS and ISR to practice with. Just like renovating a building. It be one colour and you practice changing the colours then changing the design. After a while you have the confidants to make your own style.
The are several ways to code what you make. I use NML and NFO and after all these years I still don't understand all the coding but I get by and some how things work.
So if you want to give it a go I sure members will push you too.
I got health problems to with permanent brain damage .. coding and drawing is keeping me alive as keeps my brain active .. if I didn't do this I probably be a vegetable now. So keep your self active pal.