A nifty keyword tool can be found here
http://www.yooter.com/keyword/
you can choose country & download/export results in different formats for leisurely perusal
(.....just hope my fishy, nuke overtaking, friend doesn't mind - you know who you are

)
your anchor text should contain the keywords/phrases that you are aiming for and these indeed should feature within your page text also. Best advice as above go for one or two per page only.
If you are getting traffic but not converting then it is a great idea to look at what your competition is doing - what have they got you havn't? Is your site as pleasant to visit as theirs?
...it is unfortunately the case that once a site manages to get traffic if can fail on actually closing a 'sale' for a variety of reasons...but if you can attune your site to provide a similar look/feel & general offerings to that of your competitors it may be that you see improvements in conversion.