On putting up a Facebook account :

Yes, it will likely help drum up some business ... but, it will have to be monitored often. If you've checked out the Crappie.com FB page, you may have noticed that it can get some "unwanted" postings every now & then. Porn, people advertising their own products, foul language, and other such problems have occurred on their page. I've had to "report" several of these instances.
And since Slab's wife mostly runs the page, there's really not any questions answered by her ... she just posts some articles & threads from this site. If it's a business site, you're likely going to get people posting questions .... so you may need to spend quite a bit of time keeping up with what's happening on your page.

You might also consider business cards, and place them in surrounding "fishing related" businesses/shops.

... cp