Here's the fast version:

1. Vote on http://minecraftservers.org/vote/19812 everyday.
2. Rank up when ever you reach level 120.
3. Try not to get killed, mauled, slained, swallowed by zombie.
4. If you're zombie, try to kill everyone to reduce time and gain exp.
5. Try to save some exp before ranking up to a prestige
6. Do not.... I repeat, Do not rank up to prestige 8,9,10. Not fixed yet.
7. I'll probably stay on 6-7 if i were you :D

I'll edit this further, have fun enjoying infection

 

Thank you.

 

Quick suggestion for item #2: avoid immediately prestiging to prestige 2 as the kit is inferior to 1, and it can also be a good idea to wait at prestige 6 SgtMaj as 7 is hard to get levels early with ;)