Congratulations.
Make sure you have somebody check it out before you take possession.
The 'bargain' BMW can quickly become a nightmare when things start to break.
Make sure the timing belt is up to date, which is a known E30 weak spot.
Get the Bentley manual (now that you have the car, no more excuses on that one) and the 3-series enthusiast's companion.
If it doesn't work out, I know a nice E36 . . .