i have gone through this game without finding like even one weapon blueprint and im pretty sure they're in the game so anyone know some are or what quests to get them from?

Only schematics I know of are the Powder Charge at the prison, and Cook-Cooks stew west of NV.

http://fallout.wikia.com/wiki/Fallout:_New_Vegas_crafting#Weapons

I found one for "billboards" on Michael Angelo's workbench. It seems that it does not have a use in the game however.

The Dog Tag Unarmed weapon is one that you can make (it hidden in the hangers). Theres the Rock-It Launcher but it bugged as the weapon it self dont exist (IE cant make it) so only 2 with the Powder Charge (3 once Rock-It Launcher added).