As a Lizard player, I can offer a few more bits of advice on how to deal with the scaly ones:
--If he brings salamanders, you're going to have to do something about them. They will eat your infantry alive, will make a mess of any war machines they can get in range of, and will roast pistolier units in one shot. "Do something about them" can mean not letting them get shots in on anything you especially care about, but either way, they're going to have to be dealt with.
--Saurus units don't mind being flanked as much as many things. A Saurus unit that takes a fully-ranked unit in the front and a detachment in the flank, while starting five down, will get a big pile of attacks back and -- if a BSB is around, which one usually will be -- will often refuse to break until it munches through your detachment.
--Don't waste firepower on a stegadon unless you really, really need to (to stop it from flanking something, for instance.) The things are durable, even under cannon fire (5+ "you hit a skink" save, 5 wounds), and don't weaken until they're all-the-way-dead. You'll often be better off shooting at kroxigors or even terradons, especially if the terradons are away from the general.
--The Jaguar Saurus of Doom is a war-machine muncher. About the best you can do is flee the crew and kill the now-vulnerable lizard with something else nearby (remember grapeshot!)
--Lizards have trouble with things with high armor saves: knights, in the Empire case. Just keep them away from the kroxigors, and remember that Lizards are incredibly hard to break on the charge: you don't want to get them stuck someplace and then get kroxies/a Jag Saurus with a great weapon in your flank.
--You have a huge range advantage. Lizard shooting is brutal, but it's all short-ranged. The last thing you want to do is come to the Lizard player with infantry, even if it seems like you have to in order to get at a unit of Salamanders. They'll just scoot back and blow more things up.
--Don't even bother engaging temple guard with infantry. Flanks or no, you won't break them, and they'll make a mess. (If you can get cavalry stuck in their flank, though, you can pin them in place.) Shoot the temple guard, not the slann: you won't kill it without a lot of luck, and then you'll have a rather ticked-off pile of lizards on top of you that don't pay 18 points a model just to be hard to break.
--Keep Pistoliers away from Skinks if you can.