to make it easy, let's assume you and all your active opponents are deepstacked.
what you want is your bet sizing to be consistent; so generally regardless of the actual strength of your hand if you make a bet on a certain street it should be consistent.
preflop
in the early tourney levels you can raise between 2-5x the BB
in the mid levels you won't usually want to raise more than 2.5-3.5x the BB
in the later levels min raises and 2.5x raises are more common
if there is a limper ahead of you and you want to raise, raise more than your usual standard, for instance if you normally raise 2.5x and there is 1 limper raise about 3.5x. If there are 2 limpers raise about 4-4.5x
flop
on the flop, we'll talk in % of the pot.
It is pretty standard for flop bets to be about 50-70% of the pot.
betting 2/3 the pot usually denies your opponent proper odds, while still making your C-bets profitable.
turn
Usually the turn is a little bit smaller % of the pot, and about twice your previous bet. maybe 40-50% of the pot
river
Same with the river bet, usually a little smaller % of pot, a little bigger than the turn bet. Except river bets can really be all over the place from tiny to huge, but often if you are going for real value you'll bet about 40% of the pot on the river.
This all gets way more complicated when you have to think about effective stack sizes...but let's master the basics first!