What Website Do You Go To In Order To Make An Mmd Video And How Do You Download It To Your Computer/laptop?

I am trying to make my first MMD, but I don't know where to start or how. Could some other anime lover please help me?????? I have been wondering how to make an MMD to download to Youtube for a really long time now. Please leave me a link in order to find the website and please description as simple as

Watch movies online