Create a smaller game, something that's within your limitations. The things you ask are often easy even for a semi-decent programmer. When you're ready to program something like that, you shouldn't have to ask how to do it.
Start out with something easier, like a platform game. 99 out of 100 MMF2 RPG's fails, and most of those are started by people with more programming skills and determination than you who let your projects die when you can't figure something out. Statistically, there's an 1% chance to succeed, and everyone believes that they are magically one of those people who belong to that 1%. I had to spend 7 years on projects I could never finish before I found out that I wasn't one of them either.
Now I realize how pointless my attempts was, as it took me 6-8 hours of work per day over a period of 10 months to create
Knytt Stories which is ten times as small as I planned my RPG's to be. When I started KS I had nearly 10 years of experience with the IMSI & Clickteam products, and worth to mention is that the hours I worked on KS was all productive time. I created material
all of the time. I didn't even have to spend time on finding out how to program certain features; I knew how to do it already.
I'm not saying that it's impossible for you to do this though, but right now it is. The answers to the questions you ask should be completely obvious to you if you want to stand a chance, and you should be able to think of several different ways to implement each feature, and consider which one that works best in your case.