Yes, you do. You continue your fight for survival though out the Capital Wasteland.
No you can play on afterwards.
no you continue with what you already had
You finish the normal campaign then it will kick in.
I'm not sure for the pitt, or point lookout but for broken steel you do.
If you have downloaded broken steel, you will automatically be able to level up in any part of the game.
yes, you must download the "Broken Steel" add-on for the game. you will then continue your journey and be able to do quest you previously didn't have time for before.
Yes they are, although they play much smaller part than they did in Fallout 3
All the DLC packs are side missions only and must be completed before you end the game. None of them extend the main quest like Broken Steel did for Fallout 3.
There is no proper order, but to play safe I would download them in date realeased, which is Operation: Anchroage, The Pitt, Broken Steel, Point Lookout, and soon coming Mothercraft Zeta
No you can't still play O:A if they're hostile. Try sleeping for about 36-48 in game hours. Generally that cancels out previous hostilities.
well the ending is u dying but if u play it wth the broken steel add on u will wake up 2 weeks later i dont think you die i think you go into a coma and plus fallout has alternate endings so yeah
well, if you wanna play broken steel you have to pass the game again, but if you wanna play the otehr ones, just start it and play it until you get out of the vault.