Jupiter made a nice post. One thing I disagree with though is raising all pockets. I think it is probably best to openlimp in EP 22-88 and raise 99-AA. In MP maybe raise 77 and 88 too. In late position never openlimp a hand.
Your plan with a low/mid pocket pair is to see a flop and then stack someone when you hit a set against their TP. At low stakes everybody is willing to stack off with TPTK. And IMO, there's no need to put in extra money pf. They'll stack off to you either way.

Apart from openlimping pocket pairs, I don't think it's ok to open limp anything else.

BTW, my advice applies to small stakes FR. I don't advise openlimping at higher stakes.

I play 5 max NL HE. I went tried out a lot of different things when I started playing online. I played FR, short handed and sngs of course the occasional MTT or HU game.

The 1st time I settled I played SnGs. I realized there wasn't enough money in it and moved on to cash games. I then played FR for a few months. I started doing well, but after a while I got bored and moved to 5max. I think this is where I'm going to stay. You get to play more hands and so it's therefore more fun and exciting.

I definitely advice playing 6max or 5 max for a while. You learn different skills from each type of game and even if you move back to FR it will still help you a lot. You learn to play the player and post flop a lot more when playing shorthanded.

1 more thing. Play aggressively. Bet your hands and don't slow play. Never check a big hand on more than 1 street. ie. if you flop a set OOP to a pf aggressor - it's ok to check the flop, but if he checks behind, then bet the turn and river. Don't slowplay. Build a big pot with a big hand.

Good luck

For small stakes: bet your good hands. fold your bad 1s. the only bluffing should really be cbetting