But the real question is not where to advertise but what method/platform you use to advertise. If you are big social media fan, then you would advertise on Facebook/Twitter/YouTube and similar sites.
If you are not very social, you would choose something like PPC(Pay Per Click)or banner advertisement.
If you like writing, then you would begin your own blog and rely on SEO (Search Engine Optimization) to advertise your business.
If you have no money, then you would do free classified ads.
If you do not have any time then you would choose S-Builder ( https://www.sfimg.com/PowerTools/SBuilder?referrer=search
or PSA's to Go:https://www.tripleclicks.com/detail.php?item=344064
Your very best option would be to contact your upline and ask if he/she is running a Co-Op.
But the real question is not where to advertise but what method/platform you use to advertise. If you are big social media fan, then you would advertise on Facebook/Twitter/YouTube and similar sites.
If you are not very social, you would choose something like PPC(Pay Per Click)or banner advertisement.
If you like writing, then you would begin your own blog and rely on SEO (Search Engine Optimization) to advertise your business.