Hi,
Its very easy to point a domain to a Blogger blog actually. Basically there are two ways:
1. Domain forwarding: Buy a domain from a provider and forward it to your blog address.
2. Domain Mapping: Buy a domain and change its CNAME to point to your blog. Google provides free domain mapping and it should only cost you the price of the domain.
If you require more help, please feel free to post more specific questions.