What do I need to do for my taxes if I start an online boutique business?

It depends upon the type of business and how it was organized.  Please see Starting a Business for more details on what you need to be aware of when starting your business.

We also have a few other resources that might assist and I have included those links below.  You should also make sure to check with your state as sometimes states do have additional filing requirements that may not be required for federal purposes.

What type of entity is my business?

How does starting a business affect my taxes?

Should I file my business and personal taxes together?

As this is a tax forum, we cannot really address your questions on brand but if you have more specific questions on the taxation of your business, please comment back with more details on how the business has been set up as far as being a sole proprietorship, a partnership, etc. as well as the state it was organized in and we will do our best to assist you.