2 - Can I pay for my domain name for several years ?

Yes, you can pay your domain name for a period of 1, 2, 5 or 10 years, but only, for domain names of .COM .NET .ORG type. To buy a domain name for several years is a legal planning in order that you are benefited with a preferential rate and you are off the risks of forgetfulness about the regulation of the annual payment.