Help with opening a clothing store?

I'm 16 and striving to open a small/little bussiness. I have a great friend, friend since kindergarden, who's mom opened a thrift clothing business about two years ago and seen how happy she is running that. this gave me the idea to look into the clothing business and got some tips from her. I also got some information on this from the Internet. Here's what I got:

-to get the clothing cheap to nothing, got to flea markets or garage sales and tell them that you'll haul the cloths that don't sell off for free or give them like $5.

-location!location!location!!!

-get the legal documents and all that taken care off. Taxing, billing, store rent, ext.

And more...

I have my parents to help me in all the processes and how to do what I need to do. I'm have some money and Christmas is around the corrner, so there's more money to get started. I know this may not happen soon but maybe I could start selling on the Internet, I'm great at the computer.

So all I'm asking for is some advice for getting started and what way should I go with this?

Thanks in advance:)