Because you are an Australian company with an Australian domain and hosting in Australia you will find it harder to rank on Google.com - especially for competitive keywords.

To be honest after looking at your site I don't think you're quite at your fighting weight for competing on tough keywords in a foreign search engine.

If you really want to rank in the US you might want to conduct an onsite audit to check for issues (example-home link in top nav links to /index) and also invest some time into link building.

Hope that helps.

You can learn a lot.

But what you'll learn is probably a lot different from what you'll hear on SEOMoz.

I wouldn't want to say that one is right and one is wrong but right now I wouldn't pay for access to Warrior Forums.

There is an argument that linking out might increase your rankings by a tiny bit.

So long as it's a decent, none malware hosting, none spammy site it won't have  an adverse effect.

With regard to follow/no-follow - if you trust the site and think it's passing a benefit to users then why put the no-follow on it?