I want to create a Sport Brand Which Sellign ( Shorts, T-Shirt, etc. )

You can use a website called teespring to create T-shirt designs that you can sell and collect payment via paypal

This website can support your business too: https://www.customink.com/

You can do this work in your personal website or any marketplace.

So what's your question? You want a brand name?

If you're from Turkey, you can start with your own city as a target.
You may test to create a website using blogspot and put your own domain name on it.
Something like littleturkeysportshop.com or istanbulminisportshop.com will be perfect for your brand name.
Use a simple template like pinterest style (if you like to put more photos of your product) or like youtube style (if you like to embed more videos of your product).
You can get a nice or good looking blogspot templates (even with responsive mode for mobile audiences) from soratemplates.com. It's free, or you can pay small money to delete their brand in the bottom.
You can set your own house's living room as your mini shop/store and put your product nicely in it.
Then you can take picture (photo) or record simple smartphone video of your products.
And for your website promotion, you better do it manually or offline using simple flyer/brochure to your own local community first.
You can also ask your family, friends and relatives to help you spread the word of mouth about your shop.
The thing that you must think is how you will stand of the crowd by being unique or interesting.
I heard that Turkey is hard against internet social media like facebook, twitter and whatsapp.
So, you may also use SMS-marketing for an option to promote your business.
I hope this help you.
Thanks.

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