Tingle has some good advice there. I don't use Stopping Power for personal reasons, so I use Double Tap with one. Especially with a bolt-action rifle such as the Mosin Nagant, which has terrible ROF.
I also equip a bayonet with my bolt, its incredibly handy up close since I don't like to risk no-scoping (which also drags down accuracy severely!).
You might want to put Second Chance on as well, considering the fact a majority of WAW players use only machine guns, so early off you're going to get killed a lot with it. Lets face it, you're pretty ****ed if some guy with an MP40 ambushes you up front.
As for the first tier perk, that's entirely up to you. I use Satchel Charges as I'm a Run'N'Gunner.