SEO and subdomains.

I'm planning on creating a site with some longtail keywords i have found but i'm slightly worried about the seo implications.

for example only "not my keywords"

the main site would be say movie-trailers.com and then i would setup some subdomains for other longtails within the niche such as: action-movies.movie-trailers.com, horror-movies.movie-trailers.com, comedy-movies.movie-trailers.com

I know that linking them all together would be bad but, what i was planning to do was to use the movie-trailers.com site as the directory site and add links to all the subdomains from there but no links from the subdomains back to the main domain.

My question is would i still be able to rank high for the subdomain keywords just like a regular domain or would there be some kind of negative impact for using subs?

no negative impact but building trust in G with sub domains take time unless you have a authority website.

You should never link them together but getting backlinks to subdomains is excellent for seo.

I have been waiting for Google, Yahoo and Bing to index my subdomain blog for almost 2 weeks now. It is 100% white hat and i have submitted the sitemap manually to all 3 search engines. Backlinks pinged etc.

My main domain got indexed in a few days..

But this might aswell be PEBKAC since I'm such a newbie

Sorry I am new here but what is wrong with linking them together. Any by that do you mean like using his example:

"View other movie categories here:
- Comedy + link
- Romance + link
- Adult + link
- Action + link"

On the side of say your Animation category subdomain?