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1. One post per blog. Just like people, one site can only vote once for another site. Conditions apply.

2. Yes. go for the in content link as Google usually strips out all surrounding content such as the side bar because its irrelevant.

3. Yes. First fold is more expensive for advertising for a reason.

Tip: Try not to worry so much about the "where" and "how" many questions. Focus instead on building the best content for a specific audience that you can.

I would not recommend that.

The homepage is best left for short tail generic keywords, users go their who are unsure and still researching.

If you are actually making money from that keyword, rather optimise for that by creating a dedicated page that focuses on pulling the user through the purchasing cycle. I would 301 from I would 301 to xxxxxx.com/keyword-z to xxxxxx.com/keyword-z.

I found Google usually pics about 3-4 related phrases it will let you rank well for per page.