Unfortunately there's no simple answer to this question. The rigging of a real sailing vessel contains hundreds of blocks in at least a dozen sizes. Replicating all of them in a model probably isn't practical, but a well-rigged model has several different sizes of blocks. As a practical matter, the three or four smallest sizes in the Bluejacket line will yield a pretty convincing model. How many of each size depends on how much rigging the model's going to have.
As a general guide, a block that's a foot long is a mighty big block. The ones that come with the Revell kit are definitely on the big side. I'm a big fan of Bluejacket blocks, but be warned: working with the smaller sizes of them takes some time and some practice. The holes in the 3/32" ones frequently have to be drilled out, and the grooves around them have to be cleaned up. In my opinion the results justify the effort - and the considerable expense. Here's a link to some photos of my model of the Continental frigate
Hancock, which is rigged almost entirely with Bluejacket blocks and deadeyes:
http://gallery.drydockmodels.com/album194 .
You really need a good set of plans to do this job. Good sources are Bluejacket, Model Shipways, and the Smithsonian. (The Revell kit is based on the plans by George Campbell that the Smithsonian commissioned.)
Two Golden Rules of ship model rigging: 1. If in doubt regarding line or block size, err on the small side. 2. If in doubt regarding line color, err on the dark side.
Hope this helps a little. Good luck.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.