Whats the best looking armor? Light Medium Heavy or what do you wear? Post a picture and tell me the location where you found it.
Do you unlock weapon mods as you level up because I cant seem to find any ones i want from Chet but the wiki says that he has alot...
You will not get specific locations in the General Section, that is a spoiler to name specific places or quests that you get stuff with. The Fallout Vault has the specific locations and you can look them up there
http://fallout.wikia.com/wiki/Portal:Fallout:_New_Vegas
Now, to your other parts:
Best looking is subjective, I like to put the females Companions in the Reinforced Armor and the males in the Recon or Combat armors. Since I play on Casual, it does not matter if they don't have maximum protection. For myself, it is Recon for the Sneak Bonus.
As for Weapon Mods, they do unlock at certain levels, same with weapons from Vendors.
Also, the Vendor's inventory will reset every 73 Game hours, and that is per session. If you leave the game, you have to start the 73 hour cycle over again. So, Wait or Sleep 3 Days and 1 Hour if you have to see if it changes.
You can find most weapons, or a unique example of a weapon class in the game somewhere, if you can handle what it takes to get to the place and what you have to do when you get there. However decent weapons can be obtained early on if you are careful about it. Thing is, I have found that the game is pretty good at getting you the weapons that you need as you follow along the early part of the Main Quest and do some side quests along the way. By the time you reach the Strip this way, you will be level 8 to 12 and the Vendors will start having the fun guns in their stocks.