Marketing is a HUGE field, there's so much one could say about it, that it's hard to know where to start. So don't expect anyone to be able (or willing) to give you a cookie-cutter, step-by-step instructional guide, or to write a book here. There are tons of marketing books out there already. To be completely honest, you should probably consider going on Amazon.com, or to a used bookstore, and look for a cheap used copy of a generic "marketing 101" textbook and read through that for starters.
Beyond that, there are a ton of web based resources, and there are some HN regulars who have written quite a bit on the topic. Check out, for example, what swombat has to say:
http://swombat.com/founders_library
grep through that list for the marketing related ones.
Likewise, patio11 has written a lot about marketing.
http://www.kalzumeus.com/greatest-hits/
You might want to look through some of the interviews and courses available on Mixergy.com as well. Even the stuff you have to pay for is well worth it. Personally, I recommend a Mixergy subscription.
Also look into the marketing related courses on sites like Udemy or Coursera, or stuff from MIT's OCW.
https://www.udemy.com/courses/search?q=marketing
You could also do worse than reading the stuff Seth Godin puts out. http://sethgodin.typepad.com/