Hello Kevin & Welcome
You asked a great question, and I imagine it will spark some interesting discussion & resources. I'll dive in and give you my take:
If I were going to sell sporting goods and apparel, I would simply set up an online store instead of a content-based site. You can easily optimize store/sales pages just as well as informational pages (Karon Thackston has some really good information specifically on this topic, I'll try to look that up and give you the title - I believe it was a special report instead of inside of her main guide).
Content sites are great, but dont overlook the concept of a basic online store - there are plenty of them out there that are very profitable.
Back to content sites & locating niches and developing content: you can basically pick a topic off the top of your head and then research it from various angles at
WordTracker (they offer an unlimited free trial). This will give you an idea of the 'demand' for that market, as they show the approximate number of daily searches for any given keyword or phrase. (note: look at the "Predict" column for this number)
It helps if you know the topic, or are passionate enough about it to learn everything you could ever need to know and continue working in that market. If it's something
way out of your range, you'll quickly become bored or burned out with it. This is the reason people say "go with your passion" or "start with what you know".
Most people also advise you to go with something that isnt competitive (sometimes called "micro niche marketing"). But you can easily hit a very broad & competitive market and then break down your site by categories and sub-categories that are "micro niches" within that market. Each page of your site can be optimized to rank well for it's specific Primary Keyword Phrase, so the more 'depth' you have to your site, the more opportunities you have to capitalize on a whole slew of "micro niche markets" under the umbrella of a broad and competitive topic.
I'll share with you, too, something I wrote earlier this morning on a
private forum which you may find helpful/interesting. It was in regards to affiliate marketing / developing content sites:
Lynn wrote:I think that one of the fastest ways to begin earning money online (starting from ground zero) would be to develop a free infoproduct in a less competitive niche - such as a report or guide - and to put viral marketing into motion. From this point you could build a list and earn a profit from the resources mentioned in the document as well as the follow-ups. In the time that followed, one could develop a website or forum (or even a blog) around the topic and direct all of their traffic (subscribers) to that. You could continue to build around that topic over time, of course, but you would have immediate profit potential from the beginning.
When I say "less competitive niche" I mean either completely outside of internet marketing, or something very focused/specialized within IM. Examples off the top of my head: growing roses, planting a vegetable garden, feng shui, over the hill party ideas, the single parents summer survival guide, grill recipes & quick outdoor/picnic dinner ideas, tattoo ideas/designs - or literally anything else under the sun that you want to develop and work within.
Before choosing a topic, you would want to do your research and make sure you could monetize it effectively. Search for affiliate programs, find out what is available in that market, potential JV partners, etc.
We were discussing quicker ways to generate income online, considering the change to Google Adwords Affiliate Policy and their Sandboxing (or evaluation period) for a new site in their search engine listings.
Developing content: You are obviously a good writer (your post above proves that), so choosing a topic you
know would be a huge plus. You can easily read up on everything that is available online or at the local library, and then write from that knowledge/experience. If it was something you could do hands-on (such as growing roses, planting a vegetable garden, extreme sports, etc) then you could also take pictures and keep a journal which would make for great original content.
But when it comes to 'stuffy' stuff, things you really know nothing about but believe would be good money makers... you can simply re-print articles on the topic that you find in any of the major article banks. Another good source to consider is
Public Domain content.
You can also locate the experts in any given field and offer them the feature spot in that category or on that page of your site (the one that is most relevant to what they do/offer). They can write up a unique article for your site, and in exchange you post their photo and link along with a brief bio.
I hope this helps spark some ideas. I look forward to hearing more from you & getting to know you a bit more!