If you limp with strong holdings, such as suited broadway hands (AK>>JT) and mid-to-high pocket pairs, you will lose more often than not. However, if you raise at least three big blinds pre-flop with such hands , as well as your monsters, you’ll find yourself taking down a few hands before the flop and, if you do it right, facing only one or two callers much of the rest of the time.
There are other factors, such as the player under the gun limping. If you’ve noticed that they don’t play every hand, their call is a concern. You can limp behind and invite a multi-player hand if you’re at the lower end of the range I just discussed, but if you’re nearer the top, say suited KQ or better, a half-pot raise could serve as a value bet. If they call, be careful going forward. If they re-raise, fold anything other than KK or AA.
If you do raise pre-flop, you’ll be expected to make a continuation bet. Again, it should be a half-pot or pot bet. Remember that you’ll only hit one in three hands on average with unpaired hands and the same applies to your opponents. If they’ve missed, they’ll usually fold and you can take down the pot. If they call, it’s a judgment call whether to make another bet on the turn. Whenever you don’t bet, flop, turn, or river, other players will often fill the void and you’ll be the one making the tough decision. You have to strike a balance between not losing big pots and not being bullied. That sense only comes with experience.
One thing I don’t recommend is leading out with min bets (one big blind), not ever, but especially after you’ve raised. It just looks weak. I know some players use that as a trick to draw a raise when they’ve got the nuts, but as a rule, it’s a horrible play. Again, if you raise and are re-raised, take a minute before shoving.
Best of luck going forward.