well, i'll try and give you some advice
oldblood: take the scar vet honestly, for considerably fewer points you get a hero who is almost as good, its not that the oldblood is bad its just the scar vet is undercosted for his brutality
-i like running a mounted scar vet with the BBOC or stick him in a unit of saurus with a great weapon and hide of the old ones
skink priests: because you're not going with a slaan i'd bring a level 2 with a scroll, you will need some magic defense and in eight edition a level 4 is almost mandatory, but you can get away with a level 2. the investment is worth it so that your opponent doesn't have free reign to cast as much as he wants. put the priest in a unit of skirmishers or even cohorts.
cohorts are good to protect the priest but they are even better to be used as throw away units to mess up your opponents battle line. use them to just mess with your opponent but field them in the minimum amounts. i also play with Skrox which are fun but onyl semi competitive. essentially think of them as 35 wound kroxigors, you wont be winning combat rez much but they are great for tearing apart high toughness monsters like bone giants or lone monster characters who can't stop the stubborn.
i <3 skirmishers
Saurus: yup you pretty much got it, run
Hw/s 5x anything up to about 5, after that make them 6 wide and give them spears, (spears only become effective when you have about 30 saurus). i knwo some people horde them but its expensive and its basically your whole army so I'd advise against it.
cham skinks: they're okay not great but they do what they need to, which is hunt war machines. they die pretty easily tho and are costly to lose
CoC: anothe runit i like to take because of the fluff but they hit like a bowl
fo jello. with a charcater in them they become fairly good but with the new rules for stubborn do not expect them to win a combat on their own (6 of mine lost to 10
WE archers *sigh*)
terradons suck and so do krox but i like them
yea, the temple guard are onyl useful with the slaan, otherwise their overpriced saurus, wityh the slaan they are mosters ebcause stick them in the center of your battle line and they will never die, especially qwith the lore of life. they are my anchor which my army pivots around.
yes razordons are okay but salamanders are simply incredible
Stegadons: take the ancient, its a few more points but the real damage is done on impact hits and the extra point of strength is nice and os is the extra wound. the howdah weapons are next to useless i find anyways unless you take an EOTG which is fun and cn be great or can be a real let down, depending on how much your dice like you.
slaan: yes they are a little powerful at 1-1.5K they are a little powerful at 3K too. this is what makes lizardmen dominate. the core of the army makes it competitive in that we have the best core in the game for the points. however, the slaan really is unstoppable, i've gone magic phases where my opponents stop throne of vines and then let me cats all 6 other spells in the lore of light.
Hope that's understandable