Question on my SEO plan! Need your advise

I'm now doing a plan to SEO for my website and these things are what I do:

+ create about 100 wordpress.com blog and blogspot.com
+ write 3 articles for each blog, by my hand
+ each blog has different template and widget ... etc
+ build for each blog some backlinks
+ all of 100 blogs have niche that related to my main blog

So, do backlinks from 100 those blogs back to my main site are good enough ?

---updated---

I have some ways and tips to make sure these blog get in different c-class IP, then it will be okay.

I have plan to building these blog, keep writing on each as normal blog and create more than one blog post point back to my main blog post -> Does it good ? Of course all article are unique. The 100 blogs not have all post point back to my blog, it also have other post with normal post.

So the question at here: more than one blog post point from those blogs to my blog still good ?

Good but instead of just using wordpress.com and blogspot.com why not use other web 2.0 sites aswell? you can find lists of various high pr web 2.0s that you can post articles on. It only makes sense to vary up your backlinks.

Try to diversify your blogging source. Better you make 100 blogs with 100 diferent providers, not only wordpress and blogspot.

You wont get much ip diversity from just two blogging sources. You have to use many different platforms.

Grandeaurz said:

You wont get much ip diversity from just two blogging sources. You have to use many different platforms.

Click to expand...

Update with more answers above. Thank you for your advise.

Your strategy will be good but will be better if you can get backlinks from multiple sources like social media, article sites, news sites, wiki etc and diversify your keywords.

According to me it's better for you to diversify your backlink profile. You can diversify your profile by posting web2.0's on different sites such as:

* Livejournal
* Blogger
* Weebly
* Tumbler
* Jimbdo
* Wix
* Bravenet
* Yola
* Webs
* Diigo

You can also go for pdf submissions and article submissions.

Put your content on as many high pr, do-follow web2.0s as you can but different ones.

But don't put your moneysite link on there until your 2.0s have been indexed and have a fair bit of content on them.

instead of creating 100's of only wordpress blog's or web2.0's i think you've other better option's to go for, Use other web 2.0 creation sites ie.. blogger, jimdo, livejournal etc.add some link funnel and bookmarking circle in your web 20s., Blogging source and keyword diversification much impactful.

Why only web2.0 ? Try PBN, Guest Posts and other platforms as well.
Go for all quality sources of links and make sure your link profile looks clean.
Get original content for TIER1.
Do get backlinks for Tier 2 ( Can be automated links but make sure you don't overdo it)
Get social signals for your site.

Its a combination, make sure you have as many sources and platforms but at the same time the quality matters.

You can rank better with 20 pbn links compared to hundreds of web2.0s.