How to Sell an Object

I was thinking of opening up a store and I tried making a poster for the wall to sell, like the majority of other stores do.

I got as far as putting my clothing into the contents tab, but cannot figure out which settings to use to make it so people cannot just Right Click and Open. I of course want people to have to buy the clothes.

Is there a tut. or a few quick steps someone can explain?

Torley Linden made a video tutorial on how to do just that. You can find the videos at
http://secondlife.com/my/whatnext/video-tutorials/

do a search for "How to open and sell boxes"

Ok, I did all that but when I right click my box/poster in the pop up circle menu the PAY/BUY option is not highlighted therefore disallowing me to buy it and the OPEN option is.

Is it doing this because its my object or is something wrong?

Near the bottom of the "General" tab of the object edit window are the settings for "For Sale", and they are pretty much self-explanatory.

Be aware that there have been issues with the permissions of an object's contents resetting themselves to unwanted values, so be sure to thoroughly test your "vendor" (that is what a box that sells stuff tends to be called here) on a friend or an alt before going live with it.

That's just because it's your object.