Wow! Thank you for all your advice. This is all the things that I need right now. I've watched so many videos on youtube about GMRS and grasp the concept of repeaters and what they are for. Now I understand what they do. I have a Midland MXT275 in my vehicle and a Baofeng UV5R (which I know I cannot use as it is not type approved). I am awaiting delivery of a UV9G which I am hoping is type approved. I have Chirp installed and have successfully programmed by UV5R with it. I feel like I'm getting there, it's just learning how the pieces I've got down fit together. I'm going to re-read your reply a few times more and see if I can get my midland programmed for this local repeater. Thanks again I really appreciate your help.
Update - Ok, I've just attempted to set up my Midland in the following way:
I set the Repeater channels to ON
I set the channel to 19rp which corresponds to the RX freq of 462.650
I set the PL to DCS and chose the code which corresponds to code given on the MyGMRS map according to the chart in the Midland manual.
I gave my callsign and asked anyone who may have heard me to respond but I heard silence.
Maybe I am too far away from the repeater?
Does it sound like I've set things correctly? Even if I am not close enough to the repeater at home it would be nice to be able to confirm that I know how to set my radio up and I can try it while at work which is closer.