I have heard u can buy guilds from people, for cheaper than creating one your self where does this trade take place, can you use a med ? Thank you for help in advanced as i know many helpers are very busy.

general chat or the donor forum, if you have access
a med is always used

Yes people post theirs guilds for sale in the Donor Forum and General Chat and most are less than the costs of creating your own, and already include more member slots, custom ranks, etc.

A mediator is required and when someone posts their guild for sale you usually see a mediator post saying they can help with mediation when a buyer is found.

here's a list of those currently for sale (last updated yesterday)
http://forums.d2jsp.org/topic.php?t=48158022&f=34

You can check here for Existing Guilds For Sale


Also look in General Chat or Donor Forum (if u have access) for guilds for sale not listed yet

Thank you all ! Very very helpful