Costs will vary hugely depending on the type of bookstore you are taking on, the premises you use and the rarity of the books that you wish to sell.
The kind of costs you need to consider include:
*Removal and relocation costs
*The cost of your lease and rent deposit
*Print and mailing costs for any catalogues you produce
*It is advisable to have the first six months' operation expenses in reserve, as you will not turn over a profit from day one