OK, so I have a fairly new character that has only specialized in combat so far, and I'm planning to make him a warrior type, but who also has skill in either Sneak/Lockpicking or Conjuration/Enchant. But I can't decide... I'm pretty new to Skyrim so I don't know which would be the best/most effective way to go. These are the skills I'm going to use:

One-handed
Heavy Armor
Smithing
Archery
Block
Lockpicking or Conjuration
Sneak or Enchant

Does this build look good btw? feel free to improve it, if you want.

Thanks.

Are you using a shield?
If you want it to be warrior role play-ey then I'd go for enchanting maybe?
Have fun

well if you plan on using the bow alot it might be a good idea to go with sneak as it will max out the potential damage a bow can cause. but if not i say go the other way just to be different

The funnest character to play as (for me) is the assassin/ thief

I have tried, mage warrior but nothing is more fun then cutting the necks open of your enemies when they don't even know you are there. As you progress in assasin you slowly begin to become unstoppable. Once i finish everything with my assassin, I will make another assassin

I always go with sneak, lockpicking, smithing, enchanting, archery, light ot heavy armor, two or single hand weapons and speech. Right now my current character I am RPing is heavy armor, Two handed weapons, unarmed combat, sneak, smithing, speech, enchant and archery.

I agree.
I use illusion, one handed (sneak obviously).. And I've started using destruction.
I'll fireball my enemies instead of using a bow once I get the Silent casting perk.

Hail sithis!