I got bored of playing just the regular fallout since I couldn't continue past the end of the game. I gave my friend FO3 and I'm getting GoTY since I dont want to pay $50 dollars to get all the DLC. (my friend gave me 20 for FO3). I was wondering what xpac I should play through first? A lot of people are saying Point Lookout.

IMO a good place to get your feet wet frostbitten is Operation Anchorage.

Besides Broken Steel, you can play them in any order you like, however Point lookout and Mothership Zeta seem more geared towards the higher levels.

That depends on you, I usually play Operation Anchourage first when I'm around level 8 or so, once completed you can choose from a lot of things in the armoury you unlock, like a near invinicble power armour, there's also a good amount of ammo.

The choice is yours though, Point Lookout is good, but it's best done around level 19/20. Mothership Zeta has some good weapons to get and a good amount of loot, The Pitt doesn't offer a lot, but it does throw in a moral choice. Broken Steel fairly begins when you complete the main story, while before that it bumps your level cap from 20 to 30 and throws in two new opponents that appear at later levels - albino rad scorpions which are tough and fast and feral ghoul reavers who are really tough and really fast.