First, you must spell sponsorship correctly. That will help keep your resume out of the trash pile as often.
Second, you don't get anything for "free". You get discounts, maybe even free product, but you EARN it.
I am "sponsored" per se by a manufacturer's rep company. These are the companies that work to get ABC's product into the tackle stores. There are a lot of companies trying to get into the limited floor space available in any retailer.
Of the companies I represent for this manufacturer's rep company, one is VERY good in their sponsorship compensation. ONE. I represent 6 companies for them. One of the companies I represent has a pro-staff program where I can actually go to BPS and buy the product off their shelf cheaper than my discount through the manufacturer. I am NOT complaining by any means. I'm just trying to point out that sponsorships vary and some give you more exposure than "freebies". I'm also just starting, so things may get better, but the companies I represent, I do so proudly because their products are simply in "best of class". There are companies that I have chosen not to represent. The one thing in this world that you have sole control over is your reputation.
One of the extra benefits I get is that I get to participate in industry-sponsored activities (such as the BPS Spring Fishing Classic). I like jacking my jaws about products. I also get to work alongside some of the better local fishermen. I got to chat with a guy who (if memory serves) finished 9th in the Bassmaster Classic last year... THE FREAKING BASSMASTER CLASSIC! Now, he's not a household name, but I was in the presence of someone who's got the talent. You can't put a price on that.
Whatever you do, if you don't believe that "Billy's spinnerbaits" are the best spinnerbaits for the money or best period, don't ask them for a sponsorship. However, if you fish Billy's spinnerbaits and spend YOUR money on them because you believe in them, then approach the company.
For instance, Trilene Big Game is not on my radar, even if they asked me. I don't like that line (a lot of people do, but I don't). I don't fish with it, and short of something like catfishing, I wouldn't even consider spooling it up. Abu Garcia reels is another that I have no interest in. I fish Shimano baitcasters. I'd consider changing brands to Daiwa or Quantum, but Abu doesn't make low-profile baitcasters that I believe in. Next year, they might. Until such time, I have NO business representing that company.
Keep your integrity, and I'll give you one more hint. There is not the kind of markup one might think there is in reels. I checked into Shimano sponsorship, and to be honest, I'd rather pay retail for them and not be indebted to them for the discount they offer. They also require that you use their rods as part of the deal. I am sold on a different brand of rod and cannot in good faith, try to sell their rods.
I've tried very hard not to name names, but have in a few cases to illustrate my point.
Let's go back to reels for a second. As stated, I'm a Shimano guy. I do believe that Daiwa makes a very good product as well. I could have just as easily been a Daiwa guy, and if they knocked on my door (which does NOT happen, by the way) and offered me a sponsorship, I'd go buy one of their reels and determine if it was as good (or better) than a Shimano in the same price range and if so, could accept such a sponsorship. However, I couldn't do that for Bassmaster brand reels.