Just purchased 3124kb...now what!

[amijab]

We are sooo excited! We just drove to a neighbor state and purchased a used 3124kb. We even camped in it on the way home. However we are pretty clueless about some of the systems. For example, I am sort of not wanting to use the toilet...I have read stories on this forum of them leaking and stinking etc. I will admit though that I would love it once in a while. Does anyone else just use the bathroom for changing their clothes😜.
Next, how do I get the heater to work? I do have a binder full of Manuels and papers but I still do not understand.
Third, ummm I know nothing about how to use those propane cylinders ...like how to light them, turn it on, use the oven etc
And lastly, the batteries... I am guessing I need to recharge them before our trip next week to Montana (Glacier wahooo).
Any help for us newbies would be great. We know how to hook it up, put it up, take it down. It is like a glorified tent right now.
Thanks