Welcome to the Darkside Race. Pick out a section of time to collect at first. Perhaps the 12 Caesars or the 5 Good Emperors, maybe a Reverse type (Sol, Victory, etc). Another great book is ERIC II. Have fun. :devil:
I would say to buy what you like. Why limit yourself or set rules when it will limit your collection? At least thats the way I collect. I find that when you try to convince yourself to collect only a certain series you end up missing out on a lot of interesting coins out there. And besides the more varied coins you have the more you learn about history and the world.
Wildwinds is a good source, but acsearch.info, Helvetica's (http://www.catbikes.ch/coinstuff/coins-ric.htm) and coinproject.com are all good on line sources
All of the online resources are good in their own way but none will ever be complete. Keeping them free from error is a full time job since many of the posted coins are from dealers who do not have any better understanding of some of the issues than we do. There are errors in all references and new discoveries are made every day. Coins are assigned and reassigned to different mints with some regularity when a student undertakes an updated study. Some of us try to keep up but the amount of updated and revised scholarship since the publication of the standard references is impressive. For one person to keep up AND run a business seems a Herculean task. I am impressed by some of the best of the dealers but buy coins where they turn up. Wildwinds and Coin Project are run by people who know a lot and put forth a lot of effort but they will miss a few things that get submitted. We all need to be patient and help where we can.