1. How many post per day just for one blog does Google like ?

2. How many blogs can I host on the same IP / Hosting account without rising Google flag ?

Well I read in an ebook before that you should try not to post more than 4 times a day in blogger, but then again, if the updates are genuine and real.....it will still be reviewed by a human after being flagged and would be allowed to pass.

I am not sure about ur second qn. Though if you have a hosting account.......dun just get blogger blogs. Go to co.cc or .tk to get free domains and host them on your account. This way you are not putting everything into one basket.

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As long the IP of your hosting account is not banned or penetrated by google you can host as many domains as you want on it.

(If you want to start a BIG project, it is better to buy a dedicated Server with a own IP)

If you're actually writing your own content, by the time you do a few quality posts, the day is full anyway. If you're doing PLR or some such, then keep it to a few per day. You can always ramp it up over time.

around 5 to 7 posts per day are fine
you can host as many blogs as you want on ip but you should not inter link them. because google hates inter linking your own sites.