create a video sales self updating project

we are in spain ,experts in motorhomes ,we would like to have a joint project with a website designer that needs to know spanish ,it needs to be in spanish for spanish users ,the website should contain videos and pictures but mostly videos so that people that want to sell a caravan or motorhomes or camping equipment can put up a video ,it can be a web master and a person that takes care of the website and we can do the marketing part of going around presenting the project and doing the contracts ,or it can be made like many sales webs like e bay ecetera ,please notice that if its possible to have a long term basis and expenses shared (and naturally gain shared )kind of you put the website making and keeping it ,we put the marketing and know how and get in contact with all the clients companies ecetera .thanks for your attention