I have no degree but I do have a Tefl certificate. I have gotten a job offer from an agent of China but the girl wants me to get a tourist visa and travel to China. Do you think it's ok for me?

Sounds okay to me, mate; it's pretty standard for FT's without degrees to arrive on an L Visa; they will change it into an F Visa for you, and you can teach on that. Just make sure that they have sent you a sample contract for you to look at; but don't expect them to state on the contract that they will be getting you an F Visa, because strictly speaking it's an unofficial arrangement; however, you'll be in good company because thousands of other FT's arrive with a tourist visa. Expect them to tell you a few porky pies regarding your luxury flat and other things...but don't start grumbling, grumblers make themselves and everybody else around them pretty miserable in China. Good luck, go for it, dear boy. Be sure to let us know how things worked out for you, please.