B-Tech GMRS-50V2 Questions

I am very new to radios in general and recently purchased my first side-by-side that has a B-Tech radio. I somewhat understand how to use the 462MHz frequencies but usually have trouble when riding with people who have citizen band radios (like channels 1-11). I have read and reread the user manual and played with the radio and a handheld cb radio several times and usually I can find a channel that works. But some channels will not and sometimes I can't get reception or sometimes can send but not receive. Can someone walk me through the correct process? How would I know if my radio has been pre-programmed a certain way and should I consider doing a reset on my unit?
Apologies for sounding like the complete newb that I am but I am really on the struggle-bus with this. We have a 4-day ride coming up in October and I need to figure this out. The other riders will have cb radios but the park where we will be riding (North Cumberland Wildlife Management) has a repeater and recovery vehicles can be contacted if needed so it is a huge safety factor for me to figure this out. Thanks in advance.