RE: creating new player
From reading around this forum, it seems that data for created players isnt being extracted form the editor, and SI are aware and working to fix the problem!
Regarding editing existing players, and changing money with Man utd, when in the editor load database, type in manchester united in club search, and then their should be a finances tab which you can change, also the same for players except you need to click on the player tab,
when starting a new game with these changes in effect make sure you change the database to the one yo edited and then it should be changed to your new specification!
let me know how it goes