Hi and welcome to YT.
As others have said there is no standard when it comes to a mixed breed dog as they could end up looking more yorkie or more maltese
I know there are a few people here who own morkies though so Im sure you will be able to get all the information you need here at YT.
Also about your user name, you may have to make another YT account (if that is allowed) to change your name because admin does not allow you to change the user name of your YT account
Good luck!