You know, most of you are right and i would like to thank you for all your good advices and supports, i will keep those in my minds.
For the location, at the mall, it will be too expensive for renting, i made some researchs and talked around.
It is better to start with a small spot and if the business is good then i can try bigger. Selling betta doesn't need a lot of space just to start.
4 years ago, i use to go to the flea market in SJ and sell my betta for the weekend and the sale was really good but it was 2 hrs driving so man i was so tired when i got home. The first time i went to SJ flea market, because i didnt know if my betta fishes will sell, i only brought the ones that everyone knows such as the vt and ct, males and females, all the colors available and colors you won't find at your lfs. I took 300 fishes with me, 50 vt males, 150 ct males, 50 vt females and 50 ct females. I was selling vt males for $2 any color and females $0.50. Ct males any color $4 and females $1.50. I have colors like white, black, gold, yellow, yellow pineapple, butterfly, mustard gaz, marble, orange and i was selling them for $4, same price like the regulars colors.
At 2pm in the afternoon, i sold all my fishes. I could not believe it, people was keep coming but i have no more fishes for them and that was only my 1st day, so i told them i'm coming back tomorrow and i will be at the same spot. The next day, i took more, but same quantity for the vt and ct. I took 30 hm pairs, 30 hmplakat pairs, few giants hmplakat, few wild type and few fighters 5 stars. I decided to take different tail types because they were asking for those and i asked my brother and my syster to join me cause selling betta at a flea market demanding a lot of works. I also brought betta supplies such as IAL, banana leaves, betta scoops, betta jars. At the end of that day, i only have around 50 females left, all the males have been sold. I was like WOW!!! This is too good to be true, i was surprised that there was so many people who would buy those little betta fishes. I went only to SJ for 2 months and for each weekend then i stop because like i said, too much driving and too much fatigues but business was good, i wish i live just next door. Sometimes, you can't have everything you want.
Then, 2 years ago, i decided to try to let people come to my place and select their own colors and type of betta they want. A lot of people come and go, business was really good. Sometimes, just in a week, half of my betta was gone. But, there was few issues that i need to take care and that was for the safety of my house and his surrounding and also public restroom, my customers wre starting to ask if they could use the restrooms in my house, that is a NO NO, or people was smoking in my backyard which i told them you can not smoke here. So, i closed my doors to them and of course i explained why. Most understood the reasons but they were also sad not to be able to get what they want anymore.
When i opened my doors to everyone, i have customers came from Fresno, Modesto, Sacramento, Stockton, SF, Oakland, Davis, Burkley, Redding, Bakersfield, Los Angeles, San Diego and few couples who was coming from the East Coast such as Tennesse, Ohio, Texas and Oklahoma, but they bought a bunch and they did not flew, they drove so they could take a lot of fishes back with them.
So, i guess i have answered to few of your concerns.