Fallout 3 expansions????? Help????

i have fallout 3 goty edition and i am on the scientific pursuits quest and i already did 3 side quest and i was wondering when i should play the expansions? Like is there a order i should do them in?

by the way i am a level 10

The DLC has no bearing on the main story. Play them in whatever order you want.

The Broken Steel DLC will automatically start after you beat the game's original ending.