Some of my favorite tools/necessities
1. Snake Hook, I used a "pro" version for a while but then went back to one made from a common garden hoe. Take a 9 dollar hoe from Walmart or Home Depot and smack the strait edge off with a hammer (one or two wacks does it) and it leaves a beautiful hook! Very strong to for turning over stuff with out getting to close to something like a rattler.
2. Good camera with an adjustable monopod or tripod.
3. Wear good boots not so much for the snakes (most vipers can bite though leather anyway) but just to protect your ankles, etc.
4. Cotton sacks if you are going to keep anything. Know your local laws :smash:
5. Good field guide is nice to have. I know all the venomous stuff in the US (ain't hard) but a guide is still nice when you find something a bit different especially many of the juveniles that look different as babies.
6. A partner, herping can get you hurt, just walking in the woods can so a partner is a great idea just to be safe, I have and do do it alone but not as a first choice.
7. GPS, I have a Lorrance H20 I use for fishing too. You can get them under a hundred bucks though now in any sporting and most department stores. Not needed but really nice.
As for where to look anywhere dark and nice to hide in or under. Or any place to catch some rays. Water sources should never be ignored.
There is also something to be said for just doing it in time you get a "sense" of where to look on any particular day. Also get of the paths that 100 people walk on a day and get into the real woods, etc. This is where the GPS really helps.
The other nice part of GPS is marking where you find everything to the foot, that is pretty nice for future trips.