@OP
I also have CB12 and are very much in the dark still as to what to do with it. I printed out the 300 pages PDF file but it does not provide a great deal about what you can actually DO with the program. I tried to look at some videos but I found them not very insightful.
There is a lot of talk about a personal repertoire database you can build, but I don't really grasp how to do it and what to gain from it. It would certainly be helpful to see from an experienced fellow user how this is sensibly done. I guess if you sit down a 100 hours with the program, you probably figure it out yourself. But anyway this particular feature I am pretty clueless about.
One thing you cannot do is play a game against the engine. CB uses an engine only for position analysis.
One other thing you can do is load instructional DVD videos from CB and go through these lessons. That's actually quite good.
I guess main usage is just to collect, analyse and comment your own games and study the positions against the Mega Database, learn what the masters did in those positions, get new ideas.
You can also handily prepare yourself for your next match against M.Carlsen.
I have never used this software before, I downloaded it for 99 Euros. I must confess it is really hard to know what to do. I have seen a number of videos about the software but they show heaps of chess engins. Plus heaps of games, database's etc. My ChessBase 12 looks empty and I don't know how to play a game, if I can play a game? There are tons of things I can put in there that cost lots of money. Are there any tips about free programs I can use? Especially chess engins, opening books, games I can create trees with. Anything at all I'm sure would be welcome. Thank you