Hi and welcome to the forum.
Just to let you know the rules of the forum state that all items for sale must have a fixed price or the moderators will lock your thread.
Either you can put a price that you're happy with or you could ask people their opinion on what it's worth in the "How much is my xyz worth" thread. The link to that is viewtopic.php?f=1&t=29681
Here is a link to the classified rules and regs page http://www.retrobike.co.uk/wiki/Classif ... _Procedure
It's not very strict it just makes life a lot easier. You can also edit your threads later so if you put a price up and nobody bites then you can always drop the price.
Hope that helps. Once again hi and welcome!