sign up with blacknight if that is who ye are going with.
Use the domain ye have as the domain ye want to use :P
Ye'll get a link and be able to upload all your files.
Initiate a domain transfer with blacknight
transfer domain names ireland, move domains - Transfer Domains: Blacknight Solutions
ye'll have to pay for another year of the domain.
Wait ... and it should go across ...
Derren will get an email to his gmail account ... and hey presto follow the simple instructions and away ye go