Oh,i feel your pain
I'm a stealth char myself,and at lower levels i had the exact same problem.Right now i eat them for breakfast,but they were pain in the back when i was about level 10-15 (I'm not sure really,i don't remember)
You're a Marksman right?You will need a good bow (Dwarwen is about minimum required IMO) and some decent arrows.Just run backwards and shot the damn thing from distance.Oh,and do the critical hit will you.......
It's also highly recommendable to make poisons and poison your weapons.Are you an Alchemist?If you aren't it's time you start developing Alchemy at least as a misc skill.....Trust me,this will pay off.
Use your Illusion skill.Invisibility can be very useful,at start even more useful than Chameleon.However you will need a little bit more magicka for Invisibility.Or you can mix an Invisibility potion.
Eben with this,thet're not easy.And you don't have to fight them really:All the loot you get from a troll is Troll Fat.Just sneak past it.There will be enough time for payback at later levels
