I find it a very therapeutic and pleasant pastime making my own rigs. Especially when there's a wee dram handy!
Also makes a change from dressing salmon and trout flies too.
In my opinion it also works out very economical, especially when you see the prices for patterns available in packets. Also, I do often worry about the reliability of some of the knots used in bought rigs; in particular, cheaper rigs from unknown manufacturers as most of these rigs are probably made by kids in 3rd world countries for a pittance. And very little quality control.
Plenty of sources for rig "patterns":
The Sea Angler's step-by-step guide to Bait and Rigs: John Wilson
from Sea Angler magazine. Mine cost £8.99
Plenty of rig patterns with recipes and some video step-by steps.
Other resources are available online. Just do a search. E.g. sea fishing rigs.
Tools? A simple vice (on a firm base), (I use my fly tying vice). Small pliers, scissors/toe-nail clippers/sharp side cutters, and tweezers are useful.
What the man said, its good advice. Tight lines Dave.