The only characters allowed are letters, numbers and hyphens.
No other punctuation marks or spaces are allowed in domain names.
Domain names must have less than 63 characters (67 total when including the dot and three letters indicating the domain extension).
Domain names can not begin or end with a hyphen.
All domain names are usually registered within 24 hours of the receipt of payment.
Once Successfully registered nobody can register your domain name, but it still takes 1-2 days for it to show up in the WHOIS database.
Internationally, Domain registration is done on a First-come-first-serve basis. The domain requested may be registered by some other person/organization in between the period of request for domain registration and the receipt of payment.