Meta keywords are no longer being used by most search engines, especially Google. I suggest removing all meta keyword data because the only thing it does is it allows competitors to see what keywords you are trying to target.

Most popular search engines don't use this to rank anymore, and it is best to not do this.

One quick note, footer links aren't always that great to have anymore now a days.

If you are selling the TEAM France shirts, then yes..you should most definitely put that. Not just Football shirts. So each product should be, American Football Shirt, or France Football Shirt.

It really depends what benefits the shopper and what makes it easier for them to read.

You don't want to try to optimize the content but have your customers driven away by confusing titles and descriptions.

Home and Homepage is mostly used, you should just stick to those.

Not 100% important pertaining to the Contact Form.

BUT, I forgot where I read this statistic but customers are more highly subjected to inquire more of a business, if there are some trust signals. Signals like SSL certificates, payment acceptance and yes, contact information.

Contact forms are not fully needed, but doesn't hurt if it is purely service based like SEO consulting. But you should 100% put your business address, phone number, and email on the front page, probably on the sidebar or header.

Can be 100-1000.

It really doesn't matter as long as it is fluid and doesn't look like it is there to be keyword stuffing. For category and product pages, I suggest under 75-150 words because that should be enough to get the message through.

And again, too many keywords is not good, so try not to stuff keywords.

Homepage can have a bit more content since it is trying to attract the customer in the first place.

In the end, whatever it takes to get the message through w/ SEO in the back of your mind.