Equalizer's right, there are no hard and fast rules but there are definitely things one would tend to do.
When recording, usually you'd go mic to compressor to mixing board/eq. Some people will argue that you should record a signal with as little processing as possible, then process the recording after the fact, but I don't agree with this. Reverb is often sidechained through an effects bus or auxillery channel, but anything can be done anywhere after the fact. For example, since I don't own a hardware compressor, I often record the signal with some eq tweaking on the mixing board, compress it in the computer, eq it again in the computer, then add reverb at the end (often through an aux channel). However, in some situations I've EQ'd then compressed it in the compressor. This is often to compensate for bad eq at teh mixing board, though. My Reverb plug-in allows me to adjust the cutoff, so I've never been in a situation where I need EQ after it, but compressing reverb is only something you should do if you want a desired effect, and I've never done it.
My next gear purchase will likely be a hardware compressor unit.