I want to go stealth with bow and melee with 2 hander with some alchemy for poisons.

should i go heavy or light armor? or should i go both, or is that splitting up my points to much?

1) I was thinking having a sneak/pickpocket and dmg with bow enchants on my light leather
For my heavy armor just go 2hander and resistance/+stam/health

2) light armor even with melee 2hander

3) heavy armor and just be a tank archer

my main question is armor should i do 1 or 2 or 3

What are you, the Witcher?

First off, don't split the trees unless you know how to work it baby.

I think making a class via my method is a good idea. Personally, I think you should go light armor just because it will be easier for stealthing about.

if your character is female, always pick Forsworn. and get Aela as your follower and give her the Savior's Hide
number 1 sounds good