The lists provided above are good. Create accounts and publish articles to see which ones indeed work for you. Web2.0s are only worth if created manually for tiered linking, unless you have a private bot that can automate things for you. They should then be used for tiered linking.
No single answer for your questions. You can add as many articles as you feel comfortable with. You can link out to a couple of money sites, the fewer, the lesser footprints and the better it will get.
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