No. It doesn't matter what order the meta tags are in.
And as for the number of keywords. Only use keywords that are included in the content and try and get them in the title and description where possible.
I'm not entirely sure about this but I suspect the more keywords you have the less each one is worth. Certainly you wouldn't want some huge list. The order which the keywords appear is important though. Put the ones you really want to focus on first.
I'm pretty sure the search engine bots will probably truncate a long list of keywords. I certainly wouldn't bother with more than 255 characters (typical length limit for a small string variable in many databases).
btw - Are you using any tool to check SERPs (Search Engine Results Positions)? There is a tool called IBP which is good for this.
IBP & Arelis Software -Save 40% to 70% Off - iBusinessPromoter Software- Internet Business Promoter- Axandra SEO Software IBP 9
Always good to run a test before you make your changes, wait a month or two for the search engine of your choice to update its cache and run it again.
It can be very encouraging when you see positions being gained. Use it sparingly because it fires lots of requests at the chosen search engine.
Make sure you let us know in a month or two what difference all your changes make.

Oh and if your company ever wants some formal optimisation or Adwords management let me know. Our rates are very competitive and the results can be astonishing.
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