Welcome to the forum.
YouTube shows winterizing your TT videos. They have been a great help to us on many things to do with your RV. Also the search engine in this forum is a great resource. Just enter what you need to know and it will pull up the thread. That is how I learned, by reading old threads on anything RV.
Congats and best of luck. Should take about 2 gallons of the pink RV antifreeze (non-toxic) and you can get it at Walmart for like $2.99 compared to $4.99 at a camping store.
Retired January 4th, 2018 Lynne & Jerry RVM 105
04 WBGO Itasca Sunova (Miss May) Blue Ox Tow Bar
15 Equinox (Noxi) 18 RAD Mini e-bike, 04 Tracker