If I were you, I'd get at least 12/14 tracks (all mono) & 4busses - Proteus has 6 outs, u should make use of them whilst still leaving urself time to grow (More gear later on).
If ur on a budget, but if you want good results dont put ur music thru a cheap mud grinder. Get the best money can buy or you'l find u need to buy a new mixer again in 6 mths. Spend the money properly 1st time round and grow into it. Bit like baby clothes - Mumzy never brought clothes to fit bang on when u were jus born did she
Match the manufacturers with your budget - Remember, a high price dont always = quality. Sometimes , most of the time, ur paying for the name. ....On a budget, u need to go for the best in ur range
Have a look at some online stores, then read up on reviews etc - Good luck
Ps, if you have more of a comp route setup then a small mixer and multi input S'card will be more up your street.