Go slow and don't let your hearts run away with your heads. People have met their lovers in many unexpected ways. You don't know who exactly you are talking to on the Internet, so if you can exchange photos and talk on the phone before you meet, that would be wise. Marriages don't work out for a lot of reasons. Expectations and needs are two major reasons.
People have strange expectations of marriage.
They think your feelings will never change and love is automatic and that you should not have to work at a relationship. If you go into a marriage with those beliefs, then we will see you in divorce court. Marriage is a lot of work. For most of our time on Earth, we needed to be married to survive. Now people can have a long independent life full of fun, based upon their own money, so the economic need for marriage has decreased.