The biggest thing (for me anyways -especially early on) is using battery rechargers. These are one of the key things (again, for me) to get my power back up to snuff after a battle. I have used 3 or 4 of them in the lower slots instead of crew to keep my power up. I'm always on look-out for better ones. Also, you could also equip a mine, which are useful if you come across a really tough enemy - just run away out of the star system and drop mines as he follows you until he's a gonner.
Also, a great way to damage multiple ships is by equipping an EMP weapon as a secondary weapon. I use the right click slot to fire it. (plus - they seem to consume less power than some other weapons. (and you didn't sound "mean)