1# As far as temps you want to achieve the low 80's on the cool end and reach the 90's on the warm side, that can be achieved with UTH on one side and Heat lamp on the other (no worry on the lamp drying out the enclosure since sand boas require low humidity), or you can have 2 heat mat and two t-star or one if you get the heptstat 2 which will allow you to maintain to sides at 2 different temps.
2/ Best way to phrase is is to ask for the birth date (know that sand boa first shed in average 8 days after birth) and how many meals has the animal had.