I'd like to add some suggestions in relation to this Jimmy, especially for those looking for the first time and chasing for the first time. I can only go on what i've experienced up here in Darwin, but I would assume this is relevant to just about everywhere.
I guess the first thing is to at least do some planning before you go out on the road. Check the BOM radar sites and see where the fronts or storms are heading - ie: what direction. You can then decide whether you want to get behind or in front of the storm for the best visual and photographic opportunities. Know where you're going as far as location is concerned. If you know where you want to go in advance you won't have to waste time missing opportunities because you went to the wrong area. You'll be disappointed if you get stuck in the guts of the storm and you'll then have to drive through rain to try and locate where the storm is heading afterward.
Safety first above all. You might think that because there's lightning striking 'over there' that that's the best place to go? Well, if you want to get hit by them by all means do, but you'll never be able to guess where the lightning will strike. It goes without saying that you should never put yourself in that kind of situation. You don't know where the CGs are going to strike! If the storm is mature and strong enough it will produce lightning regardless of where you are, so all you have to do is be patient and beat the storm at its own game by getting ahead of it or somewhere around it where you're not in a vulnerable spot - although saying that - you can be hit by lightning anywhere in the storm's perimeter, but you'll be less likley of getting hit!
Make sure you have some knowledge of severe weather. There's lots of sites on the net to help you there. I hunted down a few sites and download and copied a plethora of info on storm glossary lingo. I also visited the BOM site and downloaded info on storm structure, assessing thunderstorms and their type. I've found that at least learning about them gives you some insight into what they are about and it is a vauable thing to get to know. It makes chasing more fun and kind of 'scientific' without the monotenous lingo! You'll find that you'll learn to 'read' the systems as they come in and if they'll develop or bust.
When you find your location don't just park on the side of the road or in someone's driveway! Have the commonsense to get right off the road or out of the way of other traffic - some people believe it or not just aren't interested in storms - so don't make yourself a hazard to someone else!
As far as rain is concerned, you'll either get wrapped in it or you won't. If you do then just slow down and turn your lights on! People behind and in front will at least see that your'e there. If the rain gets that heavy that you just can't see and your'e not confident of driving in it (as much fun as it is) then pull over and whack on our hazard lights - that way if someone else has the same idea they won't end up ramming you in the rear whilst your parked.
When you're taking photos we're all trying to get the best vantage point, unfortunately everwhere we stand will be dangerous - as far as light poles, trees and the like - (and i may be corrected here) they aren't the first things lightning will hit - it's you! We're conductors so if the pole misses out, you won't! It's photographer be aware but not alarmed! A location that has a good vantage point away from the storm will still reward you with good shots - better one's actually because your'e getting more depth and scope with the size of the front/storm. Although standing in a grove of trees is not a good idea in any event!