Hey @Cesar Ramirez,
I agree with what Brian has stated above. A couple of things to keep in mind:
1. Strategy - What is your strategy? Are you buying properties at the courthouse steps, wholesaling, or simply making offers on the MLS. I bet you might get a more refined answer if you specify your strategy :-)
2. Brokerage - You'll most likely have to hang your license with a broker. For liability and insurance reasons, not all brokers are terribly excited about agents doing creative transactions on their own behalf; they prefer conventionally financed, MLS listed, traditional type of business. You'll have to do some shopping for a good brokerage if you choose to do some "outside-the-box" type of transactions. The flip side, however, is if you find an investor friendly firm, you'll be surrounded by like-minded folk who can support your goals.
3. Opportunity Cost - Yes, the MLS and license fees cost money. But having access to good comps will cost you anyway. I believe the monthly cost for CRSData is about $60 per month so you'll be paying for good comps anyway.
4. Liability / Credibility - Again, as Brian stated, you'll be held to a higher legal standard. But on the other hand, you'll have an opportunity to learn some (not a lot) of real estate law which is hands down better than downloading a wholesaling contract off the internet from some random guru. Moreover, you can begin to introduce yourself as a real estate professional. Having access to expired listings, monthly trends, and average days on market seems useful. You'll be able to help those in the industry with your knowledge. In turn, this is not a bad way to find fellow rehabbers, wholesalers, future joint-venture partners, money lenders, etc.
5. BiggerPockets - This question has been asked almost as many times as the "how do I find motivated sellers" question under the wholesaling thread. Take a second to search your question in the BP search bar. You'll see this very debate hashed out over several pages, with reasonable arguments advanced from both sides.
After reviewing my own post, I see that i come across as "pro-license," but I've done deals without one and ultimately it's up to you and your particular strategy. Some find having a license useful; others find it unnecessary. Let us know what you decide!
Best of luck in your future decision.