Not be too much of a contrarian, but you guys are aware that Innova's not accepting any new online dealers, right? It'd be tough to set up an online disc golf store and not be able to sell Innova product. Besides, I think it's easy to delude yourself about what's involved in selling online -- what would you offer that Disc Golf Center, Gotta Go Gotta Throw, DiscNation, Marshall Street, Prime, et al., don't already offer? If the answer isn't pretty compelling, why would someone buy online from you rather than them?
I really think the keys to a successful brick and mortar operation would be location (as close to a popular course as possible), selection (meaning a broad and deep inventory -- not easy to manage starting out), knowledgeable staff, a solid connection with the local disc golf community (sponsoring events, holding clinics, offering instruction, etc., as well as developing a reputation as a good place to hang out and meet other players). Assuming you're close to a course, having a variety of low-priced higher volume non-dg-specific products (soft drinks, bottled waters, energy bars, trail mix and other snack foods, bug spray, sunscreen, etc.) would help a lot -- give people lots of reasons to drop in on their way to/from the course. If the course location offers other sports facilities (tennis courts, etc.) you might consider including supplies for those sports as well (tennis balls, for example). Pricing is always a factor, of course, but if you're convenient enough for people to drop in and be able to handle discs they're thinking about buying, a slight price premium over online retailers isn't going to be a deal-breaker for most folks.
None of that will help, of course, if there simply aren't enough disc golfers in the area to form a viable market. You should have a pretty clear sense of the market size, and of what they feel is missing from any other local retailers, before embarking on trying to establish a retail store.