Advice needed regarding applying AdSense

Hello all,

I've been reading quite some time on this forum. This is my first actual post. I couldn't think of a better place where I could ask these questions.
Here goes....

Well, I want to apply for a Google AdSense account in the (near) future. I have a Blogger blog and I also post on Squidoo and Hubpages etc. I've reading quite a lot of different things and terminology. And i've come to understand that AdSense has many (strict) rules, wich I understand why they are needed.

My first question is about the "nofollow" attribute, I think I understand what it does. Is it allowed to make a post about a new Squidoo of Hubpages article I made,for example I just made a Squidoo lens "Movie review" and I post on blogger "new review added" with a couple of sentances and a link to Squidoo, when applying for a own Adsense account. Or should I use the nofollow attribute when (inter)linking these 3 (Blogger, Squidoo and Hubpages)? Or isn't it allowed at all?

I also would like to get your advice about how many (unique, original content) posts would be enough to apply for AdSense.

I had more things I wanted to ask but I can't think of them right now. So this will do for now.
I hope i didn't ask really stupid questions or something like that.

Also I'm sorry for spelling errors etc. English is not my first language.