Rules here are that we can't discuss valuations which you would need to know prior to deciding about proper authentification/certification.
As two registered users, we can't communicate via pm, so I can't send you any info that way.
Do you have an email you don't mind posting here, or on my 'visitor wall'?
Essentially, prior to any authorized board certifying your sword, it will
probably have to have a polish in order for them to distinguish the details.
A proper polish is expensive and can often cost more than a sword is worth.
Depending where you are, your best bet at present would be to get the sword into someone's hands who knows what they're talking about.
An expert with it in his hands should be able to tell you, though without guarantees, whether there are any fatal flaws which could render it worth very little and whether it is worth pursuing polish and papers.
There are a few sword shows in the states, one or two in Australia and possibly in the UK. Everywhere else, bar Japan, you'll be very lucky as they rarely happen, if ever.
Japan is generally the only place you'll get papers, though occasionally the boards will travel to the states for a show. Ditto that for Australia but less often.
Edit - some links on papers and shows.
http://www.nbthk-ab.org/Japan.htm
http://www.ejapaneseswords.com/NTHKoverview.html
http://www.southeastjapaneseswordshowauction.com/other-show-notices.html