What level does an ftp account need for spvp?
No. A lvl 1 f2p account can join a party with “friend” who is in a hotjoin. The f2p account can right click on your party member to “join friend in PvP,” which will send him into the hotjoin match. Leaving the hotjoin match (right arrow above map) will then send the f2p account into HotM. A new account can play unranked immediately, but must be at least PvP rank 20 before playing ranked.
Another question do you get experience for doing heart of the mists?
Yes you get pvp experience and tome’s of knowledge to boost your base levels.
Another question do you get experience for doing heart of the mists?
You get tomes of knowledge for making progress in the PvP reward tracks (do unranked/ranked for this, not hotjoin). 1 tome of knowledge=1 level. If you’re win-rate is decent I’m pretty sure it’s among the fastest ways to level in the game. Plus, once your level 80, you can use your spare tomes to level up alt toons.
There are a few points of interest in HotM, so if you walk around a bit in HotM itself you can actually get your character to lvl 2.