I have to say “who has the most tools when they die wins”, so I know I’m going to be close.
Seriously, start slowly, learn in the sequence
@KingGrump suggested. Start waxing, iron scrapper, brush and a good all around wax (Hertel race wax as it works well in all conditions so it’s hard to screw up wax selection, later add specific waxes for best performance). Get a feel for your skis.
Then get into tuning, easy to blow a ton of cash here and also ruin skis here so start slow and easy. Make small adjustments and take off a little at a time and you should be ok.
I started tuning 45years ago, I can still tune with a simple file, iron, scraper and brush. (Still don’t use too much more, a guide to 2 couple of diamond stones, few more brushes). My tunes early on matched what most shops did so it encouraged me a lot.
Biggest thing I learned was go slow, have fun, and enjoy the process. Beside skis that will perform it will produce lasting memories.