Hello, and belated welcome to the forum.
Wecome also to RV ownership. You are learning the long list of things you didn't know to look for when you were looking for an RV. Like trying everything with the slide(s) retracted before buying.
If you have specific questions about what's not working and what you don't understand how to operate feel free to detail them here and well all try to help. Note that a great many times the info you need is in the Operator's Manual that you received with your RV.
It's important to always provide the details of the specific model, year and floor plan in each post asking for help. Most of us include these details in a Signature in our Profile and this puts that info in every post automatically. (you'll see mine below).
Your comment "the sales folks were sales folks" is unfortunately all too true. We see a lot of first time RV owners checking in here to lament that sad truth.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad