1. A good set of ski vises to make life easier. I tried to "jury rig" my own and they worked (with a bit of agony), but the Holmenkol or similar Swix are a joy.
2. Files and guide .... again good quality as above. The $19 ski shop specials were a waste of money.
3. Iron. OK, here you can skimp and save a few bucks. I have used an old steam iron (with holes) for a few years with no problems. Some recommend alu foil over the holes but I never found a problem. Low temp settings enough to get the wax melted and smoothed ..... you are not cooking the wax in for god sake. Put the initial $$ into the vise and file stuff and get the better iron later.
4. I you have a dedicated work bench that you don't mind getting littered with wax scrapings that may do for mounting the vises. I made my own from plastic adjustable saw horses and lumber. By the time I got done with the bolts and all ...... well, I should have just bought the bench offered from Holmenkol ..... saved a whole $20.
5. Scrapers (plastic windshield), from K-Mart will do and some Scotch Brite pads for post wax finishing. Get good quality brushes later.