Tomson, I have been following this thread and will try answer as follows.
(Taken that my answer is from a customer (buyer) point of view and not from a sellers view)
Taken into consideration what all the other guys said I personally would like to see and have the following in a tackle shop
First.
A tackle shop who has its products priced so that you dont have to ask for a better price or compare labelled prices to other stores.
Meaning,
The price displayed is the price you pay. There are just some people that walk into any store read the displayed price and react on that, they are either to shy, or just dont bother to ask for discount.
When speaking to other anglers they then respond to the displayed price by saying "dont buy there, you must see what the stuff costs" which actually is far from the truth as he could maybe eg received a 20% discount which in turn would have made that store directly competitive if not cheaper.
A good example is go to 5 diff tackle shops and ask the price on any Trinidad reel, My bet is that you will go home with 5 diff prices.
Secondly.
A good product display.
People buy with their eyes firstly, " hey have yo SEEN this new xxxxx whatever" only then does everyone start enquiring further.
Same principal, motor manufacturers start advertising a car before its launched, getting peoples eyes used to it first, and then later giving the details.
Thirdly
Product knowledge is of great importance, not only knowing the product but assessing the persons situation when asking for advice.
eg. No use selling a first time R&S angler a multiplier (trini 50) and HMG rod, because he has seen other R&S use this. Poor guy has never casted with a multiplier in his life.
Rather guide him in the right direction and help him by explaining he will first have to learn to cast etc, etc,
Rather make a smaller sale, say on a grinder and cheaper rod, but you know this guy was not frustrated on the beach, but also knowing he will support you in the future.
Fourthly.
Get a GOOD COURIER coupled to a GOOD SUPPLIER.
It is impossible to keep the whole range of tackle on the market, but its not impossible to offer the person the whole range available.
Meaning.
Display product's virtually, and stating that you could have any of these items not stocked, in the shop say in 48 hrs.
If your price /delivery is right 48 hrs makes to diff.
Lastly
All the best with your venture, keep the forum informed on the progress.