We've been in our first TT now for about 3 months... so far, we've looked into a lot the stuff you are now thinking about. Purchased the following:
Wt Distr Hictch - Fastway E2 $325
Outdoor 9'x12' Nylon Mat (don't get outdoor carpet) $50
Surge Protector - Progressive Industries EMS 30amp $275
Anti-flap clamps for awning (not really need unless windy) $9
Brake Control Unit $79
MemoryFoam Mattress Pad ($50)
Collapsable Nylon Dog Crate ($29 from Walmart)
Long Butane Lighter (for gas stove & outdoor grill) $2
Coffeemaker just for the TT ($8.97 Ryval at Walmart)
Water Pressure Valve - $7?
Outdoor Lights (tiny bulb Christmas tree lights will do if you already have)
Rubber Mallet (for pounding on the WDH bars) $4
Long Padlock for trailer hitch $15
Rhino Flex Waste hose $32
Adaptor to use shore power cord at home 110 outlet $6
Drill bit for stablizer Jacks $3 (if you want to use your cordless drill)
Single Ply Toilet tissue (they make some for TT's)
Chemical for black water holding tank (can also use Calgon & Lq Laundry Soap)
Tow Vehicle Mirror $20
Finally... Ford F150 4x4 !
In addition, you should try to ensure dealer provides as much as possible such as Water hose, Crapper hose, Shore Power extension cord, outdoor gas grill, Choc blocks, etc... never hurts to ask.
I'm sure this list is not complete... seems like there's always something else. Suggest continue to use the FR Forum as this is a great resource where folks are happy to help when you have a question. Lastly, YouTube is also a good resource that can "show" you how to do or operate things.