If you’re new to Brandmeister DMR, we recommend starting out by perusing the material at the DRC Brandmeister page. The DRC also has a good article about Brandmeister in their Roundtable newsletter, Feb 2017 issue, page 7.
Rocky Mountain Ham Radio also has a lot of information about DMR — they are mainly on the DMR-MARC network, but they are currently testing Brandmeister. At their site, click on the menu links for DMR just below their main menu.
There are, at this writing, only a few IRG club members using DMR, but we know of at least a couple others hoping to start using it in the future.