Welcome to 4A and an excellent starter choice.
1: Clean the bearing. If it has the plastic cage, get a half spec bearing with the metal cage. I have better results with those.
2: Not necessarily. Start with a standard 1A string length. Adjust from there. I find that works best. Sometimes too much string gets in the way, especially when starting out
3: Practice. Seriously. We all go through this at some point. Just keep at it and you’ll work your way through it. The GoBig gap is kinda on the narrow side due to the bearing(DO NOT put a SPEC bearing in there, it will be too wide) and it makes snags a bit easier. Just deal with it, you’ll get past it.