I recently enrolled in college, and I was given 23 semester hours for Service Schools. Will this count for promotion points in civilian Ed?

Any credits you receive from a college counts towards civilian ed. Just make sure your S1 adds it to your ERB (SRB) so it adds up on your PPW.

Yes

Always. It is a super easy way to double dip sometimes. Get WLC (or whatever they call it now) out of the way and get that transferred into college credits and it will do the same thing. Always double check after completing a course in the Army to see if it counts for any college credit.