Pick up mining/skinning, or mining/enchanting.
Reasons?
Engineering is cool, but is really unneeded as a pally imo. The bombs are fun to throw around, but it is just a gold sink. You'd be much better off selling your ores instead. You require to be an engineer to actually use most of the stuff engineers make though, so you can't have someone else make it and use it yourself.
BS is cool as well and gives you the chance to make gear for yourself. Most of the time though, if you check the AH for a few days, the pieces you would want to make will already be listed at a lower cost than it takes to make it. You can also make weapons, but they are DAMN expensive in materials costs. Also, you can always pick up the materials as a miner and ask a guildie/friend to craft it for you.
At level 80, there are supposedly no more BoP recipes. I read this on this site, but I haven't verified it myself. If it is true, you can simply mine your own materials for the piece and tip someone else to do it.
Mining gives you straight HP bonus. The higher level miner you are, the more HP.
Skinning gives you a straight Crit bonus. Again, higher level of skinning = more crit.
As a new player, you're poor. BS/ENG will only keep you that way for many levels to come.