Hi all, i am new and i have few questions.

[Benayoun]

Hi mates, i am new at poker...
Anyways,
I am playing for like 1 month, at internet for 20 $ bankroll only, but most i play with friends for 10 $ buy in, 0.5\0.25 blinds.
Anyways, i am playing only when i have good hands, i mean when the dealer give me only pair and high cards like K Q etc.
When someone rase before flop deal i often fold if i dont have high cards.
When the flop deal (3 cards) and i dont have nothing, only the K Q for example, and the flop is 10 & Jack, which means 9 or Ace to straight, i just dont know if to call the guy who rase or not, i usually dont take the risks, and i dont know if that game is ok, i mean my friends calls me "bunker" and say that i dont take risks, I would like to have an guide which is saying when shall i take risks and when no, when to rase when to fold and etc.
Anyways another question is, if i have pair Aces at the start, before flop, shall i rase allot or just check?
if someone rase before me, shall i rase or just call him?
if the flop is deal for example 5, 6, 7 and i still got only the aces shall i rase ?
Shall i try to bluff? when shell i do it?
How i can make that no one will be able to "read" me.
I hope you understand my english, and will like to help me, if this isnt the right place to post this one i am sorry,
Kind Regards,
Benayoun.

EDIT:
I have allot of situations that i dont call on the first time i mean before flop and i fold then flop give cars and i could have full house, so i dont know what to do,shall i call and wait to the flop anytime or no?
Another question:
I have situations for example i have 100 Chips, and we set time to finish game, i have 30 mins to stay with those 100 chips and then i have nice profit, but i loose them!! dunno how, so i would like to ask, sahll i fold any bet until the game is finised or what?
thanks.