You sound new. congrats for taking up poker and trying to learn. we were all new once and it is fun and scary and you'll NEVER know it all, so just realize that nobody else at the table knows it all either. If each time you play you learn something new, you're doing just fine.
they may have more experience than you, but that can actually work against them sometimes because it is harder to make good reads against beginners, they don't play they way you think they would....
Anyways...here is my basic beginner stratgey for live mutli table tourneys
early levels (frequently the rebuy period).
Play tight and in position. observe the table and try to figure out people's betting patterns. do they always bet the same amount preflop, or does it vary? do they always bet half the pot on the flop or does it vary? will they always bet when checked to on the turn? ...and eventually you'll observe a lot more during the early levels
avoid speculative
hands and trap hands in the early levels. (67suited is a speculative hand, KJ offsuit is a trap hand). Play solid starting hands, come in for a raise, and maybe go set mining occasionally if it isn't too expensive relative to your stack because these are usually not dangerous situations....you'll either flop a set or you won't, easy enough to play.
Now, as the blinds go up you'll NEED to play more hands, if not the blinds will eat you alive. You still wanna come in for a raise, but come in for a smaller raise as the blinds go up....maybe 2.0-2.5 the BB. The more expensive the blinds are, the more crucial it is to win the pots you decide to play, so if you flop top pair or better in a raised pot, you should probably try to take the pot down ASAP.
In almost every tourney you'll eventually find yourself at a point of needing to double up. Usually this is around the 10-15 BB stack size. Some players will go into "I need a double up" mania at anything under 20BB, some players don't get desperate until 9 or less BB. You'll eventually figure out your comfort zone but it is important not to blind down to the point that when you do finally go all in your stack doesn't threaten anybody and even if you are lucky enough to double up, you still won't have enough chips to be a real contender.
When you are in "I need a double up" mode, it is better to be the one shoving all in, and ideally you'd do this in a pot where nobody else has limped or raised first. The more people who have VPIP (voluntarily put money into the pot) the bigger chance you will get called. if you have AA, that's fine but if you have 66 you'd prefer to just win the blinds.
Occasionally you'll be faced with a raise or an all in when you have a hand you would have wanted to push with. Beginners shouldn't be afraid to take a race as it may be the best
odds you have of doubling up against more skilled opponents. That means when blinds are big you can call an all-in with AK and usually AQ pretty liberally preflop, even AJ is fine if you're getting short stacked.
OK....I think that's enough for now!