[Drax]

the differences between the two systems aren't too easy to explain. it is a bit like saying what is the difference between cream and cheese - they have things in common but are vastly different overall.

Warhammer focuses more on the ability to outmanuevre your opponent and you need to consider what you use to target what unit a lot more than in 40k - basically because unlike 40k, in the main it isn't kills that determine the combat, it is the combat resolution - and that in itself depends on a number of factors.

Lizardmen aren't too difficult for a new player - they have reasonable armour and hitting power on the saurus warriors, some big guys and the wily little skinks which although not tough can really be a thorn in your opponents side.

another major plus to them is that they take leadership tests on 3d6 and select the best two - something that can really help out in combat.

conversion can be as much or as little as you want it to be - i don't think there is anything in their army which hasn't got at least one miniature representation

army size is difficult as they tend to be slightly larger, but with that in mind it would possibly be the equivelent size of a balanced tau army(?)

just start with a battalion and get a scar vet and skink blister pack - you should have nearly 1k there