Hi @Karim_Tarakji, and good to hear about your plans!
I don’t have a definitive answer to share but you can maybe have a look at https://www.sharetribe.com/community/t/how-much-do-you-pay-to-host-your-sharetribe-go-open-source-marketplace/1995 and http://www.mooreds.com/wordpress/archives/2255
Hopefully this helps a bit!