Again I recommend asking another experienced editor about this since I'm not invested in working on the TMS pages. But find a stat template that might match your needs, and copy and paste the code into your wiki sandbox and play around with the result until you have a TMS stat box that is satisfactory to the standards of the wiki, then add it as a Template:x page which can be used on the TMS mirage pages.
3: you can use your own wiki page to experiment with the code before actually putting it up so you don't screw with stuff. you can copy the pqstats template onto your sandbox and modify it as a TMS stat template, which is basically how I made stat templates myself back in the day.
1: I think Great Mara is still active but I would suggest doing what I suggested in #3 and try to copy code onto your page and mess around with it. you can learn a surprising amount and I'm saying this from experience. I can't speak for all the admins but I don't support TMS being on the SMT wiki since TMS info is excellently covered elsewhere so that's why my support for this is limp.