Howdy, Jason!
A quick and dirty reply to your questions.
1. It is best to feed a high quality dog food, not Ol' Roy or pedigree. I feed Nature's Receipe, which runs about $30 for 40 pound bag
2. Lacys are well mannered, but that is because they were raised with manners. Just like any other dog, without proper training, they will become your worst nightmare. Start training when you get your pup home and start socializing with people and dogs at 4 months and continue heavy until they are about 7 months. After that, they pretty much know how to behave around others.
3. Cost depends on the breeder, quality of pup, what you intend to do with it, etc. Non-breeding quality dogs will most likely be cheaper. They still excell at what you need done, they just do not have desirable genetics to pass on.
4. See #2. Start with short rides, and gradually go for longer rides. My short rides with Stryker were 20- 30 minutes (to the vet) and within weeks, we were on 4 hour trips.
Welcome aboard. I hope you get more information before you buy.
Crescent Moon Ranch
Raising quality commercial calves