I would recommend any broker from Sedo, but you have to pay them first then you have to pay some commissions if domain name is sold.

Other way is to be broker of your domain name yourself...

If you give time, you can learn it, there is no doubt to it, I would say.

I've used flippa.com for a sale. They did pretty good other than what I consider a f up in their code as the sale finalized (bid ended in a tie without time extension). Other than that the system itself worked good.

I have find this one which is nice - Domain Broker -- SuperNiche.com - Home i don't if it can help you