To answer the questions you asked:
Chainrings:
Get one of these:

and either a 5mm hex wrench or box end wrench to remove the bolts.

Cranks:
Get one of these:

The chainrings may be easier to pull after you pull the cranks.

For the wheels, how much space do you have on the ends of the axel on the pista? If you have about 5mm on each side, all you'll need to do is get some spacers for the hubs. If you have less than that, you'll probably want to get a longer axle and spacers.