As with any new profession, the best thing you can do is to learn as much about the field as possible. Part of the purpose of this website is to put many of those resources in one place. By reading and learning from other broker's experiences, you greatly increase your chances of being successful right off the bat. Unless you have lots of capital to invest, you want to be very careful to minimize your losses especially in the beginning when you're deciding whether to go further in the profession.
You should also get clear about your area of focus. Is it sports or concerts? It's not a bad idea to get to know one area really well. Both have advantages and disadvantages. For example, if you invest in season tickets to a sports team, it will probably take longer to get your initial investment back. It may be a third to half way through the season before you get your initial investment back. Of course, everything you get after your initial investment is pure profit.
If you have patience and a little capital to invest, buying season tickets to a baseball team could be a great way to start. I highly recommend "The Lazy Way to Buy and Sell Tickets" as a guide for buying and selling sports tickets. It's really the only book available that focuses on sports tickets, and specifically season tickets or mini-season tickets, as a way to make money. The decisions about what teams to buy tickets for and, as importantly, what seats to buy, are hugely important There are lots season tickets that are losers.
The great thing about MLB tickets, for example, is that a lot of the factors that determine whether you'll have winning tickets are easy to get the key data on – for example last years standings, predictions for next year, attendance records, etc.
Concert tickets tend to be a much quicker turnover, but may be trickier to pull winners. There's an art to picking winners for concerts, and you're often in the position of having to make snap decisions about whether to buy tickets or not. Are they the best seats? Can I do better? How much time before I lose those seats? You have mere seconds to make those key decisions.
Picking the right performers and the right venue takes research and time. The hottest shows are often extremely difficult to pull tickets for. But if you are already well versed on the concert tour scene, and if you know what bands are up and coming and which are the best venues for sold out tickets, you have a huge advantage. The best book for ensuring that you pick winners for a concert is The "Ticket Broker Guide". Be smart and disciplined when you buy.
If you're serious about getting started as a ticket broker, I can't stress enough the importance of learning from experienced brokers. With 2 or 3 books, you can be light years ahead of the competition. I suggest you spend a little time on the resources page and quick start guide.
Start small, be patient, and do your research!!