its a very large topic for one post/thread my friend.
Getting to the real issue IMO (your interest and my desire to see you succeed!)... the best advice I can give you is to spend the money on some travel to see the best stores in the nation. Do this before you finish your first draft of your business plan.
Taking the time to observe other good business models is one of THE best ways to shape your own first pass at your own model.
Different stores will have different emphasis... some will appeal to you and some will not.
Some of the best stores in thee nation are in your/our region: Old Towne Aquarium in Chicago... Country Critters in Long Island... several great shops inthe Cleveland and Baltimore areas.
The get yourself out to LA to see the wholesalers on 104th street and make connections (or seek a jobber for you, better yet... do PM me for current recommendations)
Also... you will need/want to subscribe to the trade journals (Pet Age, Pet Business, and Pet Supplies Marketing)
Be sure to attend at least one large hobby conference per year too to keep a pulse on industry events, news, trends.
And for a the crash course on a good shop... you will likely find success/profits in:
- focussing on beginners and intermediate hobbyists to a significant degree... they drive the industry and will be a majority of your short-term and long-term livelihood
- do not ignore advanced aquarists and hobby clubs... being flexible with them on large item purchases and group/volume buys will make the difference between making some money off them or losing all such profits to Internet sales
- do NOT rely on livestock as your principal means of income. You will see that very few of the best/oldest stores do this. Livestock gets people in the door and keeps us interested in the hobby... but profits there are volatile and often lean. In a sentence - your profits are at the mercy of many factors on import: weather, politics, delay, airlines, disease,etc.
- consider aquarium servicing, custom tank work (drilling, sumps, refugiums, etc) and any/all drygoods as the real staple to your livelihood
- be honest to a fault... this will pay long term dividends on referrals and long term happy (spending!) customers. Selling a mandarin fish to a newbie, eg, hurts your business in many ways and is simply not worth the sale that day.
so much more to say... do investigate the above leads.
And check out the industry info and FAQs/articles over at wetwebmedia.com
best of luck and life
Anthony