I have some kevlar thread, but only use it on jigs for salmon and steelhead because they have sharp teeth. It's not needed for crappie jigs, and yes it will tear up normal bobbins.

There's no need to go out and buy a bunch of thread if you're making jigs with chenille bodies. Just get some invisible thread from a store that sells sewing supplies. It's basically very fine monofilament. Runs about $3.50 for 400 yards, or 2,200 yards for less than $10. It comes in clear so it blends in with your chenille. I use it for 95% of my crappie jigs. Only drawback is it's very slick, so you'll need to use nail polish or head cement on the final knot so it doesn't pull out.

Personally, I wouldn't go out and buy an expensive vise right away. I started on a cheap vise from a kit, then upgraded to the Danvise I still use. Get an inexpensive vise and see if tying is something you enjoy and are going to stick with. If you decide to upgrade, you can always keep your first vise on hand for tying strung out patterns.