For Housing in Makkah, you will not find any informations online, you need to be there physically and look by yourself or with the help of one of the many small real-estate agents ( Maktab Aqaar).
For schools there are very few international schools in Makkah. The best one (but only started their international section last year) is Abdulrahman Fakeeh School www.afsch.edu.sa, my nephew is studying there in 1st grade and he/his parents are more than happy. Other schools are Al Anjal (Indian ) And Al Batool for girls.
When it comes to Gyms, I think Makkah has some good ones, You have Fitness Time there and few other good local ones.
For restaurants, many fast food brands are there plus tons of local ones, but no fine dining, for this Makkawis come to Jeddah