Where have u regged the new domain. No need to transfer it b4 selling becaue u just need to change registrant account in the same registrar to pass this to some one u sold and this is free with most of them. To sell a domain you have to list them in several marketplaces
ICANN regulations restrict transfer to another registrar for 60 days after registration. Some registrars also have their own "in-house" restrictions; eg. With Godaddy (and some of the others), the 60 day restriction resets every time there is an update to the registrant information (name or organization fields) or change of account. With most registrars, you can "push" the name to another customer account for free. Some registrars, restrict free pushes eg. Enom - 1push per each 7 day period, I believe. Others such as 1and1 do NOT offer a free push at all. .