This is an excellent idea and I have done a small amount of research into this very thing.

Here's the bad news. You'll need to spend LOTS to get into this business. A website, agencies for the outfits that you'll sell for, staff to take calls. It just isn't easy or really a small business.

But, for what it is worth here's some of the references you'll need.

ASTA is a UK outfit and I'm sure there will be a US equivalent. Google it. But by having a look at the UK outfit you'll get an idea of what you need to do.

ASTA
Founding member of ASTA UK - Association of Secondary Ticket Agents.

There are just squillions of events around the world, everywhere, every day. It's amazing the number of large and small events.

The ticketing business can be divided up into several categories. Music (the big bands and singers), major sports, minor sports, cultural (opera, plays, classical concerts), outdoor festivals and games (Olympic, Commonwealth, Asian, American etc., etc.).