Welcome. First thing figure out what class you want to build too. Is there any clubs around you? check out the build section. I've built 7 mowers and the easiest build was George's Mtd build . These step by step pic and he explains things well.also that chassis can be raced in several different classes with just a engine swap to move up or down in classes.
The more you lean it back ,it puts more preload on inside tire when turning to help you turn. Not enough makes it ( push) and too much makes it want to pull straight in the turns and burn your arms off fighting it. That's just my experience and there's a lot more too it. I'm still learning how to perfect it and it's hard because every track is different.
I had good luck last year . This winter I tryed for weeks. I gave up, after a short text back then no reply for another week. . Told me that he has a family and he does it only for a hobby. That's fine with me but when you give me a time to call you,at-least answer your phone and talk ! It was totally rude