1) I funded a live account with $2000 and started trading with practically no system.(mistake #1)
Sure - disastrous, of course, but you've learned that it was a mistake, and that's the main thing.
2) After all the reading I've done, I still don't quite understand how to develop a trading system. (entry/exit requirements).
There's a whole lot more to "a trading system" than just entry/exit requirements. But well done for not thinking of it as just "entry requirements", as many people do.
Here are three books which will help you to learn how develop a trading system, and what successful ones are based on. I recommend all three, and advise you not to trade with real money until you've read and understand all three ...
Trade Your Way to Financial Freedom - Van K. Tharp (a great book in spite of its horrible and suspicious title!)
Beyond Technical Analysis - Tushar S. Chande
Profitability and Systematic Trading - Michael Harris (this one covers the necessary knowledge of trading statistics and probability, without which - from whatever source you learn them - it won't be possible to trade profitably).
Don't imagine that you can somehow replace the education necessary from the contents of those three books with internet "information". You can't, because you don't have enough experience to know what's reliable, and to distinguish between fact and opinion and between information and misinformation.
There's a real learning-curve. Success-rates are low to very-low. It's when people look for short cuts, or naively imagine that they can make money steadily simply by "copying something that just 'works'," that a wheel normally comes off.
When you have little-to-no experience, yourself, it’s really terribly difficult to judge who’s a suitable mentor. Be very careful with people selling mentoring services.
It’s easier for people to make money that way than by trading themselves.
Make sure that anyone mentoring you is trading successfully himself. Ask to see independently corroborated evidence of that.
Ask to speak, yourself, with at least two other people who have used the mentoring service and ask them how they benefited from it. Don’t depend on "prepared email/website testimonials". Don’t be fobbed off by “lack of availability of former customers to talk with”. If anyone selling “mentoring” tries to suggest or imply that that’s a demanding or unreasonable request,
run.
There are
overwhelmingly more charlatans and scammers about than genuine mentors. Be suspicious of everyone.
Good luck!