I already have an LLC, however, It's not the brand name I want to use for my business. Should I do a DBA under that LLC? I would like to apply for a trademark on the brand, so would this structure hinder my ability to get a trademark?
Next, What are the legal requirements of selling online? If I buy the goods from a manufacturer here in Los Angels and am selling online, what licenses do i need to have?
Obtaining a federal trademark registration is a function of using the mark on goods in commerce and does not depend on who (which type of entity) owns the mark.
Fictitious business names (DBAs) frequently are used for the purpose you are considering.
Businesses in L.A. require a business license.
New businesses typically require an EIN, a bank account and a merchant account for credit card acceptance.
Your questions are pretty basic. You probably should retain a business lawyer to help you rather than relying solely on information that you receive online.
Disclaimer: This information does not constitute legal advice and does not establish an attorney-client relationship.