As to your major business competitors you can check top search engine ranking for highly competitive key phrases to see all of them :)

You may want to look into the new Safe Cosmetics Act that is currently being considered in Congress. It would require even very small businesses selling any beauty product to provide product ingredient information and meet testing requirements. We have a full article about it on our web site, BusinessNewsDaily.com. ---This post was edited to remove a commercial link. Read our discussion policies for more Community best practices.

When setting up your site don't forget about your search engine marketing.  This is something that you should be thinking about from the very beginning.  This way your site will be designed to drive quality traffic to your business - those who are looking to buy and not just looking.  If you want people to find your business online - you really have to prefect your online marketing efforts as soon as possible.Trust me - I spent years building my business first then working on trying to market it online - and got no where.  But, when I started my last business and focused on marketing from the very beginning, I finally found the success I was working so hard for. Good Luck!

Well it would take a lot of efforts as a lot of big players are playing in this market.You should start with a very niche market and then try to grow from there...you must set aside some amount for marketing also as this field of cosmetics ;needs a lot of users trust....now with chinese products and all that ...so start with very very focussed niche first advertise and brand a little...u should do fine ---This post was edited to remove a commercial link. Read our discussion policies for more Community best practices.

 So far as the issue above your competitor's list, I recommend you to appear in about the web business directories. Attempt some keywords in lookup engines like google and note the leading 10 outcomes. To grab customers and enterprise leads, join some trusted for the web business sites.

One good way to find competitors is to search for something like 'beauty products' and look at the results. To get very specific, click on the 'similar' button next to the person ranked first and you'll see all of the top websites for your specific niche. Good luck!

Yes, but there are many competitors, some companies have 1 or more inhouse SEO working for them 9 hors a day. You will need to do a full time SEO.

I see that no one mentioned you'll probably need to collect sales tax on items sold in the state you operate in; this would be where you business is located out of.

Hi friend,   I suggest you make a store on ebay. Then you need not to do advisement. And do not need many people.

The best way to find companies in this filed that are already online is to just Google the types of products you want to sell. The companies that show up first have  a strong online presence.