Is the DNS a name record relevant if I forward the domain?

Is the DNS a name record relevant if I forward the domain? I'm using GoDaddy for my domains and NearlyFreeSpeech for my hosting. I want to keep using GoDaddy for my DNS needs as it comes free with the domains.
Asked by: Guest \| Views: 160

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Guest [Entry]

"The A record is what translates the name to IP address. e.g. mydomain.com = 1.2.3.4
The CNAME is an alias for an A record. e.g. www.mydomain.com = mydomain.com
So without the A record the CNAME wouldn't go anywhere.

Wikipedia source

As far as Google going to the right place and not thinking there are two sites mydomain.com and www.mydomain.com, I've heard people use a 301 Moved Permanently or 301 Redirect. This tells Google you have moved and all the old records and ranking for the old page now should be associated with the new page. I'm not sure but I believe GoDaddy will allow you to set/customize those codes."