Pls Help Again

ctcart

if i want to try to start clothing biz (very small clothing biz, selling at pushcart, flea market) do i need to apply or register first? where should i register, they need a companyname if i wantto rent the place. now i am also looking for a place to rent, any idea any small cheap place?
where should i do the registration. even to rent a small small place also they need me to give company name, whereas i am just trying to test the marke.t

thanks alot.