Hello, it's best if you use my GB Studio Digital Clock System as your first project then you work from there. You rename it, you change the scene background, you change the sprites of the characters. Etc. Basically, a template that has the built in system for the clock to work. That's if you do not want to learn the nitty gritty details on how to make systems work. But! if you want to learn. You'll really have to study the template I made as to how it works. I made it fairly simple. I don't really make my systems function on formulas (except currency counter it has a little basic formula).
So yeah, I highly suggest you tinker with GB Studio first and start with basics. Try to imagine one thing you want to accomplish (like Player pushes object) then play around with GB Studio, search the web, ask people on reddit and just dive into it. I started from scratch 6 months ago. You can do it!