How do you start a cosmetic line and how much is it to start?

Answer 1

Depends on how complex you want to be about the venture. You can add your identity to exsisting products quite cheap. Formulating your own products is much, much more expensive.

If you only want to personalize a line, add your identity to it... try this site:
www.colorlabcosmetics.com/oldsite/html/faq1.htm

That's the best I got.

Answer 2

It can be done for under $10,000.00