BizResearcher offers great advice; SBA has resource partners like SCORE, Women’s Business Centers and Small Business Development Centers located across the country that provide free business counseling to individuals looking to start or expand a small business. Visit our local assistance guide to find your local SBA resource partners by entering your zip code.

I am very interest in starting my own clothing retail store or its a resale
clothing retail store. I am in the middle of writing my business plan. I am
confuse on what address to use when I don't have retail space yet when I am
in the middle researching. If I do apply for EIN, Register my business etc.
What address I am suppose to use?

Thanks

These are all great questions and hard to answer on a fourm like this. So, I
suggest that you find one or more of the many FREE resources out there that
can work with you one-on-one. There are Small Business Development Centers
(SBDCs), SCORE and the SBA (local SBA offices) - these organization can
provide you free help to answer all these questions and the many more that
will crop up.
First things first - start with a business plan and while you research your
business plan, many of the issues you mention here will fall into place.
Start by searching for sample business plans to get your started then start
working on your own - using the free resources mentioned above.