Welcome Miquel! These are all great replies. I would also suggest watching the webinar's that Brandon Turner puts on here. Education is key here. The more you know before your first rental, the better the outcome. Having an idea of what your goals are as well is a good idea to have a grasp on.
Some people like having an asset that appreciates in value. Some like cash flow. Some like both. It all depends on what you're trying to achieve.
Also, take a bit to think of some specific questions you might have. I know that before I found BP, I had a TON of questions that even seasoned owners didn't have the answer to. It took me 6 months before I was comfortable in buying my first rental. You might want more time, or you might want less. It's all about comfort level.
That being said, you will naturally feel hesitant, scared, discouraged, angry, happy, etc throughout your investing time. That's perfectly normal. When I bought my first rental and was in the title company's offices signing paperwork, I had a thought of "Oh God, what have I gotten myself into? This is really real now". Even though I had WAY more cash than the lender required of me, I had access to plumbers, electricians, carpenters, etc, AND I had someone I could bounce ideas off of who was a rental owner as well.
My advice? Keep focused on your goals, and push forward always to overcome obstacles. You WILL run into obstacles during all this. Banks will say no, repairs will need to be done, tenants may be late with rent, etc. Just adapt, and overcome, and I have zero doubt you'll be successful!