My boyfriend and I met online and were very much in Love. He says he going to move to where I'm living this summer to be with me and I believe him and he also said he want t get married in 2 year by then I'll be 19 and he'll be 20. I fell that I love him a lot and that I'm ready for marriage but what I want to know is how do I know he's ready for it and will it work out?

Have you met in person yet? Face to face?
If no then you should met him somewhere very public but not your house
Met,talk and if u don't like him just disappear in the crowd
Because it sounds like to me he just wants to move close to you and like take over your life just because u like him online he might be a total different person in real life

No, I do not think it is a good idea. It does not sound like you even know each other. You will know when you are ready for marriage. You know how you will know when you do not have any doubts, and because you asked this question I know you are not ready. Your having doubts.

Joe