I've moved over from Self employed Quickbooks and am concerned I am going to lose all of my saved documents. Will they trasfer over?

Hello Mbmaintenanceser, Welcome to the Community page, 

So QuickBooks self-employed and online work completely differently, it will be a case of having to start again in the new online account if you have a look at this help article it has more information about moving over from self-employed to online.