There's a wealth of information on here. I started when I was about 19, and FT has given me the knowledge to accomplish so much that I would've missed out on. I agree with some of the others; learn the ropes, but take a chance when you really like it.

Some deals will never be seen again. I was lucky enough to jump in on the 100K bonus point Amex Platinum sign up bonus. It was a risk, but it worked out. In the same toll though, it wasn't easy as a 21 year old who just bought a home trying to meet the $3k minimum spend. Certain aspects will be easier to achieve depending on your situation. You will have to learn what works best for yourself based upon the knowledge here.

If I can offer anything, take advantage of the offers that you will be able to meet. Don't be too zealous. I really hit the credit card sign up offer bonuses hard when I realized my credit score was good enough to get these bonuses. I ended up with a whole bunch of cards, which isn't a bad thing, but I found that I needed to deal with numerous annual fees that I couldn't find value in paying for after the initial sign up(Amex Platinum alone is $450/yr).

Having so many credit cards canceled after only being open one year would have wrecked my credit score, especially when it was so fragile given my age. I had to selective cancel cards with annual fees while keeping those I still received the most value from even if the annual fee was dent in my budget.

Just know your limits and be patient. There's a lot to learn, take advantage of that.