To add to the sound advice already given,
Temperament - This aspect truly runs the full gamut. I have wild Pits that are as docile and laid back as can be, and CB animals that will bite numerous times each and every time you come near them. The norm runs more towards the docile side but these snakes are truly individualistic in this regard. Some Pits are born laid back and others are born defensive. Some out grow it and others do not. At the end of the day their bites are not a serious matter for concern like it may be with some other genera. Their teeth are very sharp but not particularly long. Even the biggest of Pits will produce only superficial wounds that heal quickly. Occasionally teeth will break off and these will need to be dug out. Sounds worse than it is.
Feeding - When Pits are on they are on! They can consume enormous amounts of food in a short time, but as was pointed out by another poster moderation is the preferred regimen. Some individuals, usually wild caught specimens have a fairly narrow window of opportunity to work with. I have an adult male bullsnake that I collected from the northern sand prairies a number of years ago that confines its feeding schedule to four months each year. Despite this, he has grown into a magnificent specimen that breeds annually. When he is ready to eat I do not hold back on the food. This equates to a large rat every five days and I occasionally double up. This is the exception for sure but it may serve some purpose in demonstrating the extremes that are sometimes involved in keeping these snakes. Pits in general are known for feeding heavily and taking the occasional fast. Prolonged fast are best avoided by cooling them down in the winter months. With reproductive adults I cool for 3- 4 months. Babies are usually voracious feeders and the keeper has little of the trouble sometimes associated with other colubrids.
Size and Enclosure - The only thing I have to add is that I prefer starting hatchlings out in small boxes and moving to larger sizes as they grow. I also believe in feeding Pits heavily in their first two years. If maximum genetic potential is to be realized these first couple of years need to be capitolized on. By feeding heavy I mean two sizeable meals per week. I work with Pines and Bulls but some of the Mexican types are more delicate feeders from what I understand and if you go that direction you may want to adjust accordingly. For adults I prefer the 72 quart tubs.
Eggs - This depends on the species or even the ssp's and there is even clinal variation within ssp's. It can be as few as several eggs to as many as 20.
Morphs - They are out there and some of them are very nice. My preferrence is for the natural colored specimens with emphasis on exact locality.
Pits are a great genus of snakes to work with and by far my favorite. There is something out there for everyone and a great diversity between the various types to choose from.
Phil