If you don't know how much pressure to put in your tires, just look at the sidewall (there will be a recommendation from the manufacturer, or at least a maximum inflation pressure).
It's most efficient to pump your tires with a floor pump (you can get one at any bike shop). Your frame pump or mini-pump probably doesn't have a gauge (or at least not an accurate one) and it's much easier to get the correct pressure with a floor pump. I also wouldn't recommend using a gas station pump since they're not designed to be accurate with the high inflation values we use on bikes.
Happy riding!

