These questions are too general and have been discussed exhaustively both on this forum and in existing literature.
Here is a recent post on pre-flop sizing:
Pre/Post Strategy: Aiming for 1-2 opponents, handling 4-5 on missed flops
As for advice on what your opening range should be, this is going to depend on a range of factors including effective stack sizes and how your opponents are playing.
Given how slow live play is, its hardly surprisingly that the number one leak at low stakes live is our opponents getting bored and playing too many hands pre-flop. That does not necessarily mean that we should loosen our range. To the contrary, the
easiest way to profit is to play a tight aggressive style.
If stacks are 150bb or less and you want to be profitable you really have little choice but to play a tight style - especially given that standard raise sizes are larger than normal. I guess with 200bb or more, depending on the table, its at least theoretically possible to be profitable playing either a TAG or LAG style.
But as someone becoming accustomed to the live game it would make sense to start out tight and either stay that way or adjust as you get used to low stakes live. Do not underestimate how boring it can be and the amount of discipline required. Its not uncommon to come across only one or two playable hands per hour.