Once you do keyword research your next goal is to search engine optimze (seo) your website.

You do seo tactics, techniques and so forth to optimize your website, to make it the way search engines want it. Do not think of seo as a way to manipulate or cheat the search engines. You cannot do that. So do not fall victim of black hat techniques or tools.

Black hat refer to techinques that try to cheat the search engines, to get rankings by cheating.

So the techniques you need to use can be put down like this:

Adding content to your website. A forum, a blog, articles - the more unique content you have the better. So add some new content every day.
Getting backlinks should be done all the time, everyday. You need to get some backlinks every day. 15-30 link exchanges and some article submission every day is great. Just get the same number of backlinks everyday.Do not get a ton of links at once. Getting 1000 links on Monday for example, then nothing for the rest of the week - looks indeed spammy or cheating.

So content and backlinks are the most important things you need to do. The most important is backlinks.