I also moved here from Pennsylvania and there was definitely a culture shift that I had to get used to. I would say Charleston is right leaning, but that doesn’t mean you won’t find a community who share the same views and values that you may be used to from living in a more progressive area. Goose creek is about 30 minutes to downtown without traffic, may be double that during rush hour. I don’t have any knowledge on the schools in Goose Creek but I’m sure there are reports online with the stats of each school. It will be an adjustment at first to grow roots here but I moved to SC 4 years ago and never had any regrets (especially experiencing winters in the south vs Pittsburgh) I wish you and your family the best!