Google de-indexed all my pages except Home page

Hello !

First of all, I want to apologize if my English is not that good, it is not my primary language.
Also, I am a real beginner in SEO, so excuse me if this is a stupid question.

I've been reading a lot about SEO until one day, I finally decided to give it a try.
Few days ago, I started a website. Wrote some content, added some Amazon affiliate links, etc...

Then I was beginning to create a small link wheel. I created some Web 2.0 properties (Wordpress, Squidoo, Tumblr, etc...) with spinned content from a unique article I wrote.
All the Web 2.0 properties contain links to my primary website as well as inter-linking to each other.

Few days ago, when I checked the indexation of my website with : http : // mydomain on Google, my pages were all indexed.

Yesterday, I checked again, and there was only my home page remaining.

My website is about 1 - 2 weeks old.

Again, I'm new to all this SEO stuff, and I'm still learning, so I don't know what this means.

Does this mean that Google is seeing through my strategy and it is not liking it ?

That fact that I'm still seeing my home page indexed, does this mean that my website is not yet in the Google sandbox ?

I thank you all in advance for you answers...