I start off hatchlings with large fuzzy mice, crawlers(large fuzzy but eyes are still closed) or hoppers. I move up in size after they can handle 2 feeders of the same size. Also, I try to switch to frozen thawed starting with their second meal. I offer it using tongs. Some will take, others will take after a few more meals, and some seem to want live only. That's ok, it's more important to me to get more meals in them than if the meal is live or frozen.
As far as possible hets, 50% or 66%, I am a buyer and seller of possible hets.
As a buyer, I am looking to get 3-4 female possible hets for the price of 1 definite/100% het. I like these odds and feel that I have a better chance with more clutches. When buying 3-4 females from the same clutch, there is an excellent chance that more than 1 will be a het. 100% het males are relatively cheap and available. If you can use a male that is a visual and not a het, your 3-4 females will give you a bunch of definite hets. That's the worst you can do and would only happen if all your females turned out to be normals which is not likely. Also, very important to me, is the price of the possible hets. I don't want to pay more for a possible het hatchling than the price of an adult normal female. This way I can always get back what I paid and my loss is time and feeders. This limits my choices when buying possible hets. Some female possible hets are selling for more than $400. I'll wait until the price comes down before I invest in these.
As a seller, I'm looking to offer 3-4 possible het females for the price of 1 definite/100% het female. I'm also offering them from the same clutch. Some breeders say that it doesn't matter but every buyer that has ever contacted me about possible hets ALWAYS ask if they are from the same clutch. I price possible het males in the range of $50-$100. The same price as a good looking normal male. They are not worth more than that in my opinion. Especially since definite het males are generally cheap and readily available. You can even wait an extra year before buying your definite het male. Females take a full year longer to get up to breeding size, most of the time. In that year, the price will come down and the availability will increase. The big difference in selling as opposed to buying, I don't concern myself about the price of a possible het female being more than a normal adult female. That worst case scenario where you end up with an adult normal female instead of a het. My personal guideline is just that, my guideline. Some buyers don't want to be limited in what possible hets they buy.
Just my opinion
John Q