I have a lot of tips but I have been far too busy to type them out (55 hour work weeks) but here are a few. You can email me for more specific info..
Road Cruising: Time of year matters only for one thing, what species you will find.
NOTE: This is a broad list and from first hand experience, habitat, temperature humidity, barometric pressure, precipitation all affect actual finds.
Spring: Corns, Yellow Rats, Kingsnakes, Eastern Diamond Backs, Cotton Mouths, Pygmy rattlers, Rough Green snakes, Racers, Waters, Ribbons, Ring necks, Brown snakes, Garters, Frogs, Toads
Summer: Corns, Yellow Rats, Kingsnakes, Eastern Diamond Backs, Cotton Mouths, Pygmy rattlers, Rough Green snakes, Racers, Waters, Ribbons, Ring necks, Brown snakes, Garters, Frogs, Toads, Indigo Snakes (June, July, August are best)
Fall: Corns, Yellow Rats, Kingsnakes, Cotton Mouths, Rough Green snakes, Racers, Waters, Ribbons, Ring necks, Brown snakes, Garters, Frogs, Toads
Winter:Corns, racers, Waters, Ribbons, Ring necks, Garters, Frogs, Toads
Best conditions I have found are when it has rained within the last week preferably 1-3 days before hand. The daytime high was 75F or greater, High Barometric pressure (No near by lows/hurricanes), Habitat also plays a major role.
Field Herping:
Strong hooks are a must! The information above is helpful for conditions. Watch your hands/toes! Check under anything that can be flipped boards, tin, fallen trees, cut grass, garbage, cut compact foliage, rocks, etc. Another couple good things to check are hollow trees, by water, trees ate chest/waist height. Things that have been laying around for a while especially in piles are best. Never under estimate where you might find a snake hiding, inside of things such as hollow stumps, buildings, boxes, tires/tubes, carpeting.
Again if you want more specific feel free to email.