Shopping Cart Meta Information

[cigarplace]

Hello, my shopping cart administrator allows me to enter Meta Information for: Keywords, Meta Description and a Custom Page Title.

I can enter this information for both my "Brand Pages"(page with several products that are in the same cigar brand) and my "Product Pages"(individual product page). But, my product pages only allows me to enter Meta Desc. and Meta Keywords.

My questions are:

1- Would this be the same type of work an SEO company would do?

2- Which one of the fields would I have a better result with? The Product Page or the Brand Pages?

3- Which meta field is the most important?

4- What recommendations can be offered for each meta field? What should Key Words should I use? How many? What kind of description? How Long? How should I word the Custom Page Title? etc.

As you can see, I am not very skilled at SEO. Any recommendations for a quick SEO newbie read?

Thanks.