First of all, congratulations and welcome home!
You can call MS to make dining PS/ADR if you wish. I still call Dining directly (they also have 800 numbers). Dining opens at 7 Eastern and MS opens at 9 Eastern. If you want something tough to get (like a princess meal or V & A's), definitely call dining - if you don't, you probably won't get what you want.
I kind of hate to tie up MS making PS/ADR when they could be helping another member make reservations. If you use MS and don't have PS/ADR that are tough to get, please call in the afternoons, later in the week. That's a less busy time for MS.
Best wishes-