The first thing to do would be to start with rule number 2 from SatsLife's "How to Buy or Sell Here" thread which states....
2. Post a picture of the item you want to sell, along with your username and date/Block height next to the item. This helps to verify you actually have the item you want to sell. If you are new to the forum, post the picture at imgur.com and provide a link or use BBCode to post. Don't worry if your picture does not show up in the post. Someone with a rank higher than 'newbie' will likely add it to the thread in the following posts for you.
Good luck!
iBHK8
Noah
Yes I understand but before anyone here will take anything seriously they need to see you have proof of ownership and the above explanation allows you to do this. Once you do this you can then ask for offers or prepare an auction etc....
Also user "transvestite lamb" is correct. If it's a Cas 5BTC you have it's nickel plated brass and not gold nor is it 1 troy ounce. It should weight 7.4 grams per Elias's handbook.
Hope this is helpful for you. Cheers!
iBHK8