So I played skyrim and did basiclly every quest leveling up to 62 and became god powerful.

I decided to start over and play on masters. I just hit level13. My smithing is at 42 and archery at 58. I am having a hard time with bandit thugs. On normal I never used healing pots and now I am out of them. I have yet to start enchanting as I have not found any stuff enchanted with archery or sneak. I am playing a light armor archer thief. Not sure how to proceed to toughen up or do better damage. I don't have much money as I spent it all buying stuff to smith. I think I have 4000 gold.

Don't just head on in, assess the situation first.

I always have restoration as a skill and it really helps. I also think alchemy could help so you can make healing potions.