Hi. Good question. Here are some important points for playing in the small blind.
1) You are out of position in the small blind. So vs limpers most of your hands should be played as iso-raises and you should also have a very tight range to make up for your positional disadvantage. If the limpers are sticky stations just don't bother unless you have monsters and there is a big enough raise you can use for them to fold to. You can't iso raise if the table gives you no fold equity.
2) you can have a small overlimping range (small pocket pairs), but ONLY if the shortest stack at the table is at least 15x bigger than the amount you need to call. Your goal here is to flop a set while getting somebody to bet or call with worse such as a good pair (if you don't flop a sets just give up)
2.5) exception to giving up on the flop is if someone minraises multiway on a dry flop, then you may just still have good implied odds to set mine the turn and give up on a later street if you don't hit a set. Don't do this on a wet flop because draws may complete for others.
3) You may be tempted to overlimp or call suited connectors. Don't over-limp middle and small suited connectors from the SB. Even if you hit a flush draw your opponents will make life difficult for you because they have position on you. Exception is you can consider doing this vs. very weak players who check a lot or minraise on the flop. But if your suited connectors are very low I wouldn't bother.
4) In general overlimping is unprofitable in heads up pots. It may be profitable multiway, but mostly for set mining and not connectors (because there are more opponents who may connect with a high card on the board while your set is disguised). Your goal with set mining is to win at least 9x what you invest each time you call with a small pocket pair. Otherwise you will bleed chips in the long run.
5) In small blind vs. open-raisers, you should adopt a 3-bet or fold strategy for a large percentage of your range (which should be extremely tight because you are out of position), and maybe call only the minor bottom percent of that range.
6) In tournaments overcalling like this will cause you to bleed your stack, so even with small pocket pairs I wouldn't do it if you're under 40bb deep (or if anyone else at the table has a similarly short stack). And it will be very hard to cbet a missed flop out of position if you did raise pre from SB.
Let me know if you want anything elaborated on or clarified