Most ski maintenance and repair is pretty simple. Especially if you're not looking for a DH racers edges or an marathon skaters wax.
First step is to choose reliable stuff. Any ski failure is likely to really ruin your day, no matter what repair gear you have. Glue your mounting screws in, and make sure they don't strip. Wax with colder bulk wax and a thrift store iron. Scrape and buff with a stiff nylon brush from the hardware store. Deburr and sharper edges with a mill b-stard file. Fill smaller base hits with the coldest temp glide wax you can find. For big core shots, smooth out the gouge and make it uniform with a small curved wood chisel. Fill it to ~2mm below base leve with JB Weld. Melt in p-tex. Cover with aforementioned super cold wax. (Cold = hard)
For repair, I carry a bunch of Voile straps and some duct tape. Realistically we're talking about lashing a broken ski back together with straps and branches, or strapping your boot/partially pulled binding to the ski. Either way turns your ski into a glorified snowshoe.