Champions has been around for years and has an excellent reputation. The immediate objective, of course, is to pass the licensing exam ... hardly a slam-dunk. There's generally a prep course geared to the test ... take it.
Going to open houses isn't your best option, since the agents won't have time to speak with you at length. They'll be concentrating on the people touring the places, either as buyers or, more likely, potential new clients. Very few properties are actually sold as the direct result of attendance at open houses. Agents use them primarily as a vehicle to generate new business.
Several firms regularly stage "career nights." By all means, attend them. Call the local offices to obtain the schedules. All of them promise you the opportunity to earn a considerable income (emphasis on "opportunity") ... but you'll likely find the best fit by talking with the agents who work there. It's a very personal business on many levels. Don't be discouraged if it takes several interviews for you to be sponsored ... handling rejection is a major component in this line of work; get used to it.
You'll also need some financial resources, since you're paid on commission (split with the sponsoring brokerage ... can be anywhere from 30% to 50%), and there's generally a monthly "desk charge." This can vary widely, and may or may not include certain items such as E&O (errors and omissions) insurance. Some agencies have outstanding training available for little or no cost ... take advantage of everything you can. It will likely be several months before you see a check. I've reached the point at which I'm now affiliated with a firm that requires only a small fee for each transaction ... I get to keep 100% of what I earn, but it took me years to get there. I am the brand, not my sponsoring agency. But at this neophyte stage of your career, you need all the support you can get.
The business (yes, it is that) is comprised of far more than riding around and showing nice homes, or holding a property open for a couple of hours on a Sunday. While you'll be utilizing all the technological advances, and spending considerable time in front of a computer, real estate is personal, and there is absolutely no substitute for one-on-one contact and old-fashioned hard work. The dropout rate is incredibly high, and the odds of your succeeding are stacked against you ... it's something you need to understand going in. Until you're established, your compensation could well be in the range of minimum wage ... or less ... when factoring in the hours you spend on work-related activities. It is not a side job ... you need to devote as much time and effort as you can to learning and doing.
Of course, it does have its rewards, but instant gratification is not one of them. I love what I do, and earn a substantial living ("earn" being the operative term), despite the setbacks and speed bumps (often roadblocks) ... I've come to expect them in every transaction, and am usually correct. You'll know soon enough if it's the right career for you. I wish you well.