Is it the right move to call a BB (pre flop) if you have two flush cards and there are alot of other people in the pot?

Depends. Read more on starting hand selection.

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It depends which two cards, how many people, your position and whether you are playing limit, no limit, ring, Sng or MTT and for what buyin.

The weather and prevailing wind direction may also be a factor.

Heh heh, on this occassion I copied PJ

Ask a very general question and you will get a very general answer - like 'it depends' which is true. More specifically, however, a LOT of players will play ANY 2 suited cards from ANY position and are bleeding their bankrolls by doing so.
The odds of flopping a flush DRAW is 8.1:1 (flopping a MADE flush is 118:1). Once you have the draw, your odds of making the flush in 2 draws (turn or river) is 1.9:1 and 4.1:1 in one draw (river), although according to www.homepokergames.com/odds.php the odds of making a flush by the river is 15:1. Making a backdoor flush is about 53:1 from the flop.
What all this should tell you is that playing two suited cards for a flush is a drawing hand and for drawing hands you need a larger pot to give you the correct pot odds and that generally means the more players in the pot the better.
But every coin has another side - the more people in the pot the more likely someone will have a larger flush draw than yours and of course you also have those working on a full house. But sticking with the flush draws, if you're not playing for the nut (Ace) or 2nd nut (King) flush, you're very vulnerable to higher flush draws. This generally means you don't want to invest a lot in the pot just to have a look at the flop so you'll likely want to limp in but without extra outs such as you get from over-cards (A-K) or connectors fo str8s, limping in from an early position often means getting raised by a later position and any raise reduces pot odds to unfavourable levels for just flush draws. So to get ahead of this, a savvy player will only play High-suited connectors from an early position (and likely raise coming in) such as AKs, AQs,Ajs or ATs and leave less valued suited cards to later positons or not played at all. A 2-3s, 7-2s or even Q-2s may be a fun hand to win a pot on but will cost you more than it makes in the long run whereas a suited connector such as 5-6s thru J-Ts at least has str8 potential to add extra outs to your hand. You're still vulnerable to a higher flush but at least you're not totally dependant on a flush for a hand.
One last thing, about playing any suited cards like the Q-2s. Sometimes you'll get a flop that misses your flush draw but hits a Q on board for top pair - DANGER! Playing this hand for top pair value with a nothing kicker is a big time loser! If you can't check it thru to showdown, fold it! The money you save will keep you in poker a year longer!

Hope that give you some general ideas but for a better understanding you'll have to pick up a book.

thank you very much for the detailed answer i was looking for, i guess il be throwing thous queen/2's in future

no.

if your playing low stakes, there will usually be frequent pots where many ppl limp pf. and playing 28s or 49s is fairly stupid imo.

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Q2s is a really rough starting hand. you are hoping to make a flush with 3 (not 4) of your suit on the board, since 4 gives the K or A a better flush. you cant even be sure that a 3-on-the-board flush with Q2 is good.

if you miss your flush and pull a Q, you are dominated.

all in all just pan this hand in most situations unless you are on a blind.