Ping, what do i need to play multiplayer?

[Blackdog_kt]

Pretty much what Dutch said. As long as you have a steady ping, you should be ok.

The netcode in CoD hasn't been fully optimized yet, but in the previous IL2 series people could easily fly on 56Kbit dial-up connections with pings nearing 500msec.

The new sim is a bit more demanding and rougher around the edges, but i think your 350msec ping will be ok, as long as it's a steady one.