You can choose any one domain registrar after studying the user reviews online. Once you have chosen the domain registrar, think well for your suitable domain name and check for its availability. If it is available, you can proceed registering it. If it has already been taken and not being used, you can contact the domain name owner for a bargain. You can get the contact details of a domain name owner by having a whois lookup at
WhoisXY.com Good luck.