Hello ABDULLATIF ALMARAGHI,
You are on the right track; just post your request here, as you have done with your question. You could also find trainers through the FitnessConnect in your area and contact them directly.
Natalie aka NAPS 2 B Fit.
There are many sites you can advertise positions on. From idea to, job sites, to even free sites like Craigslist or a site that is similar in Kingdom of Bahrain. Also there are often Facebook groups if you look up your location that you could post it.
All in all the more you post it the more people can see it and even if they’re not looking they might know someone who is.