Copywriting with subsequent project management in social networks

Good den, I am interested in the cost of copywriting services. Task: to make a description of 200 real estate objects of 1000 characters each. Texts should be optimized for SEO promotion. + texts on the website for the description of services, etc.

My website is now in the open, launching in a month.
Real estate portal
I want to know the cost of copywriting and completely further work on the promotion and optimization of the site, including in this network.