Welcome Droopy!
There isn't any special GMRS lingo, no 10-4, no 73's etc. Like ham operation, you are required to USE your call sign. The main thing to know about GMRS is that its in the UHF band and signal propagation is nearly exclusively line of sight. If you are over the horizon without an elevated antenna location there will be no tranmission beyond 20 miles under any conditions. Buildings, trees, hills count as nearly 100% signal blockers. Repeaters are the big advantage of the GMRS band as licensed in the US. If you are lucky enough to be in an area with many GMRS repeaters (very much like ham and police emergency service repeaters) you may be able to work thru them for dramatically extended range beyond the 1, 2 or 3 mile normal local transmissions. Some examples: I can hear but not get into a particular repeater about 15 miles away, I can easily get into one about 2 ½ miles away and another repeater 18 miles away very well placed high up a hill and on a high tower. The repeater at 18 miles lets me communicate with others within a 25 mile radius of the repeater itself in all directions potentially 40 miles from me in that direction. Some GMRS frequencies are inhabited by legacy business licensees and are nearly useless in the immediate area of the business. Repeaters are privately owned, some require permission for use, others only ask that you operate legally.
I only have experience with Wouxon and Motorola GMRS units. Not 100% certain I would buy another Motorola, but definitely would buy another Wouxon. I have a few Baofeng hand helds, but probably wouldn't replace with same if they failed.