This kind of falls into the realm of a lot of other goods, it's absolutely saturated with products, first off, the harsh bit, nobody cares about your name/brand, it simply isn't going to impress anyone, unless your rod line is doing something that nobody else is already doing better, the tackle shops have absolutely no reason to be interested in you, now if your bringing Megabass or G Loomis quality for Black Max prices, you might just have something, but if your just another mid priced rod doing the same thing as any other mid priced rod, what possible upside do you offer? Your taking up valuable shelf/shop space, are completely unknown to both retailers and customers, it's extremely high risk and low reward.
The easier to hear bit is that if you are willing to make the sacrifices to get the thing off the ground, you can attend tackle conventions/shows, run your own website and procure private capital to fund your venture if you look in the right places, and you will learn a whole lot about manufacturing and selling products too, just remember to be realistic about your expectations, your not going to be outselling Lews or St. Croix or whoever in a very, very long time.