As Neutron_Herder said, he won't be allowed to fly out to California until he gets leave. You have to have special permission during the first two phases of school to go more than 75 miles from base, but they won't approve it for more than 400 miles. Luckily, I was within the 400 mile radius so my husband was able to fly home.
There is a restriction about having cars during Phase 1, which is from the time you make it to Goose Creek until around Week 4 of A school (it depends on how well you are doing in school, on your inspections, etc.) I think you can have a car on base, but you aren't allowed to drive. You could ship it to him, or drive it yourself, but having a car during A school isn't a necessity. Right next to NNPTC there is a bowling alley, a sports bar, a Subway and a convenience store (Mini-Nex). There isn't much else within walking distance, but there is a bus that takes people into North Charleston where there is a mall, Best Buy, restaurants, etc.
Also, during Phase 1, you aren't authorized civilian clothes and they are limited during Phase 2 so he should be fine laundry wise.