Go as like this.. take out the wager of 2 people from full time and 2 part time... Im sure yourself + one member of your family can handle the whole store...
Your start up cost or monthly cost for the first 12 months should be $9460 per month / 31 = $305 per day... The money thats over $305 is your salary... You have to see if your area / place can it generate more than $305 per day, if not your screw, you can easily close down the shop and don't have to worry about the extra "SALARY" for your staff.. That saves thousand of dollars
If the business is really booming, you made ALOT of money, and there are more customers than you can handle, then START worrying of hiring an extra hand...
Otherwise, you will just get a STORE with 2 or 3 staff standing around the whole day... (maybe doing waterchange + feeding)
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OR you can invest $1.5 million and open up your own BIG ALS store ^^