Noob HU Cash Questions...

[poker_dummy101]

Hey guys, I just have a couple questions about cash HU.

All of these questions deal with .5/1

What is a good sample size. Obv I know the more the better, but is 50k at one limit enough, or do i HAVE TO have 100k

Assuming you can play only 200 hands/hr, 4 tables, 5 hours a day..so thats what.. 4k hands/day. Does anyone know what kind of rakeback that is about assuming 27%? i dont expect anyone to give me exact details.. but if you could tell me what you get and how much you play that would help alot.

Last, I know the FAQ says if you are winning be happy. But I was wondering what kind of winrate most are trying to get. Is 10bb/100 way at the top or what?