Hi, i had oblivion a long time ago i only done a few quests and never got back to it. i recently decided to fully play it again and got the DLC's. its a little bit different than Skyrim so i have a few questions about it.

I have Mehrunes Razor, Thieves Den and Vile Lair add ons. all of them are highlighted in the data files but only thieves den worked so far. is there some quest i need to do first in order to get the other two DLC's to start? or does it require a new patch?

Second, How do i drop items from my inventory?

if i come around any other obstacles ill be sure to post them here.
Thanks.

I hate to be one of "those" kind of people, but since I play on PS3, I didn't have access to all of them. This could be quite helpful though:

http://uesp.net/wiki/Oblivion:Official_Plug-ins

Where in game are you located? The DLCs usually kick in through the end of the tutorial sewers - you should get a journal message informing you and a quest will start automatically. They may also kick in later, when you exit the sewers but not much after, at least in my game.

If you're on PC, then I think the default command to drop item is shift+left click, I don't know on consoles.