Welcome, you've chosen a good time to join as you won't have to worry about the adapting process for the new book!
Scar-vets were fantastic in the current/soon-to-be-old book, and amazingly they have only got cheaper for us with the new edition! I would highly recommend one! Deck one out to boost their WS (although you could just rely on magic for that), throw in an armour save and it's a killer. Put it on top of a cold-one and you've got a proficient character hunter on your hands!
I'd suggest a Skink Priest too (the new model looks lovely, so another reason!), just to buff up your saurus - magical buffs are a really important aspect to the army and with Priests now able to take the Lore of Beasts your Priest has just got more useful by a fair bit. Plus you'll probably want them near your saurus anyway for both the buffing, and to stop them from running amok (if the new Predatory Fighters rule would have us believe). Of course once you build yourself up to get a Slann then you're laughing, even with it's slight downgrade this edition.
As for specials: Salamanders. You'll here them hyped all the time. They've gotten slightly more expensive, but they've got an added strength to their Spout Falmes rule with it too. Add that with a -3 armour save and they're a terror on the big blocks of units you see a lot of in this editon!
Temple Guard are also useful, especially when you get a Slann. More armoured, powerful Saurus? Amen! And now they're even cheaper! A big block of these boosted by magic will tear at most enemy units.
For your first monster get a Stegadon. It was the best one in the last edition and appears to hold that title for this one too. It's gotten cheaper and gained some really useful upgrades.
As for the new units and rules changes, you're just going to have to learn with the rest of us
