Some clarification needed

Hello folks,

I'm having trouble getting a few things to click on the topic of keyword selection / rating competition.

1) If all the results for my long tail are on page 1, under pr 4, & there is less than 100k quoted results, is that fairly low competition for article marketing? If that isn't a good criteria, could you give me a better example?

2) It seems everyone says to sell what is selling, but everything I find related to the best selling products is highly competitive, and the only keywords I can find for such products that aren't contested get a couple hundred searches a month. How many monthly searches for a long tail keyword would you say is good before you pursue it?

3) Are information products much better than physical goods for article marketing? For some reason I just prefer to setup a review site for tangible products.

I have the link building strategy, I just have been writing articles and building links to a site that gets a little traffic and no sales and wondering if I missed something and just don't understand keywords.

Thanks for any / all responses!

1)yeps that gud,but the lower the pr the better.
2)go with products having mid gravity.
3)info products are better.

go with keywords having search volume in terms of 600-1k.200 is too low.

Thanks for your help, I appreciate it!