Hmmm, I believe some things you must consider are:
1. Location
2. Customer demographic (age, gender, etc)
3. Finance (e.g. bank loan, rental, expenses, etc)
4. Legal issues (e.g. rental of premises, etc)
5. Layout of the store (fixtures, shelves, etc)
6. Prices of comics
7. Balance sheet and profit-loss statement to determine when you
will breakeven, and to assess whether the venture will be
viable.