Jungle problem

So I started to main jungle and I have some mistakes that make me useless in late game . Can you help me with answer to the following questions ? :

1. How not to forget to farm
2. How much farm you need to have at - 10 , 20 , 30 mins
3. When I need to take dragons
4. When I need to gank / At what level I need to start ganking
5. When I need to take dragons
6. Can you tell 3 champs with dmg and 3 champs who are tank with cc

I will really appreciate if you answer