Extremely helpful. The basic principles of business and research have not changed much. You still identify a market, solve a pain, get paid, etc. Trying to sell your business (concept, not equity) to an experienced but not hip executive will go a long way toward validating your concept.
Unless your appeal is strictly to the hip early adopter. SCORE can't help you there.
I don't know anything about the materials at the public library you mentioned.
Your work with SCORE will (probably) not help your product. They'll help you with your business, which in the long term, as an entrepreneur, is more important if what you're doing is not just a pet project.
For Business plans, I'd go for the 20-pager if you want investors and prep a great demo/pitch presentation. Many folks (including myself) have recommended the "Business Plans That Win Money" MIT series book as well. Cheesy title but pound for pound is best I've read. http://tinyurl.com/4x9od2