First off thanks for all the help you have been throughout my tshirt journey

We are finally at the stage now were we have a WEBSITE ecommerce almost complete, a first run of 580 shirts 10 different designs, a myspace page, marketing material (stickers, business cards etc), and polybags for our product.
The last step now is the catalog, there are to many options in phrase catalog, since we have 10 designs would I be able to get by with lets say a AWESOME theme on the front of a 8.5 x 11 100lb cover flyer, and on the reverse side have our products, style numbers, colors etc? The thing is we would like to use our catalog for retail customers direct as well as wholesale. So I guess that would entail having a seperate sheet for the pricing breakdown for wholesale accounts. What opinions can you give me here
Last question, as for the line sheet what are the breakdowns where you start discounting based on volume? ie: lets say a shirt all in cost you 4.35 cent, and we sell for 10.00 to wholesale cutomers, is there a formula for the best breakdown to have here? I want to make sure when I approach the buyers, that I have my terms setup properly, minimum orders correct, and everythign they will need to know to make this as turn key as possible. Does anyone have a sample sheet, or somethign I could reference to incoporate into my structure here?Thanks as usual for the support!!