Building my first board and need some info

I’m in the process of building a 9’ 6" x 24" x 3" and I want to do 50/50 rails. Can anyone help with deck and bottom rail dimensions?

I’m not looking to do a nose rider, just a good overall cruiser. Does this mean my rails should be continuous or should I leave a hard tail for any reason.

Also I read that a Modern 50/50 rails shaped from a “usblank” typically has a rail apex 1.25" up from the bottom. Does this sound right?

Thanks for any help