Paul: Welcome to WikiTree. The fact that you already have a family tree on My Heritage means that you ahead. Now, it is a matter of adding a profile of each person to WikiTree if they do not already exist. All of your research and investigations should help when it comes to adding sources to your profiles. There is a learning curve when you start out with WikiTree, but the system allows for collaboration and consistency. I have found the support and guidance from the other volunteers very helpful and I hope that you do, too.
Jack: Welcome to you, as well. I hope that you have been enjoying your involvement with WikiTree.