[chirp_users] How to use the software

Hello, I downloaded and installed the software. I am able to access the radio but I need help with all the column headings. What is Tone mode, TSQL, DTCS, none and cross? Tone ToneSqu DTCS Code DTCS RX Code DTCS Pol MN, RR, RN, NR Cross Mode, tone->Tone, Tone->DTCS, DTCS->Tone, ->Tone, DTCS->, DTCS->DTCS Duplex none, -, +, split, off Offset Mode FM, NFM Skip

If I just want to listen to a channel and not talk on it want should the above setting be set to? If I want to use it for my RR job what do I set the above too? I know the frequencys. What is type "BM" and mode "FMN" on radio reference mean?

Thanks for your help. David