How exactly do you set up a full node? I am a little bit confused as there is a mining node and a verification/voting node for decred?
Keep an eye on the wiki everything will be updated and made clear in due course. The devs have been top notch in terms of communication but are likely swamped at the moment while they finalize everything for the launch in two weeks. I have no doubt the documentation you seek is forthcoming.
There isn't yet since the software hasn't been released. There will certainly be documentation once everything is released though.