I'd do repaints to start. Tuning a handmade crank is a lot harder than painting one. You have to know how to paint anyway so start there. If you're fishing stained water you might start with Extreme Glitter (wal-mart, craft stores, $5), a few nice lure eyes off ebay to keep the shipping cost down, and some Devcon 2 Ton epoxy for a proven, tough, non yellowing clearcoat (see the Devcon site for dealers, you may have to email but they can tell you exactly where to find it - $3) Best way to apply D2T is with a grocery bag stretched over you finger. Stick the crank lip into a weighted cardboard box and flip it every 5 minutes for about 1/2 hr. Before you clear it you might add some scales to the back using one of those fluffy plastic shower scrub things (one dollar, just lay it down on the back and spray after you've dried your base coat or maybe the first thin coat of clear) and a good can of spray paint. You may want to search around to make sure the brand of paint will work with the Devcon.
You'd could do copies of flat - sided baits such as Rapala DT flats. Much easier than copying a fat crank and it will give you a bottom up understanding of ballasts, harnesses, etc.
Get yourself a Jann's Netcraft and a Barlow's catalog. They're full of almost everthing you need and you'll learn / get ideas from them. A lot easier on the brain than reading 10,000 scattered opinions.
From there you can dive deeper and deeper.