As a starting point, play the MH-60 Demo mission which can be found both in the Demo and the Full game. The walkthrough for that one can be found here
http://www.commanders-academy.com/wi..._Demo_Tutorial . Aside from the walkthrough, the manual might be helpful for any detail issues or stuff you dont know right off the bat.
Work through this mission to get a feeling for how the game works. After you played this mission once or twice you might want to check the Kilo Tutorial here
http://www.commanders-academy.com/wi..._Demo_Tutorial and do that. Based on your experiences you made with these two missions get back to the landlubbers guide and the various resources and look ask for the next steps.