Normally when i wrote an application (mind you i mostly do this type of stuff on good old paper) it consisted of an application letter (where i found the ad, why i'm apllying for the job and why i think i might be the right one for them), my curriculum vitae, andadditional documents (like training certifications, references and such).

The magic normally is in the application letter itself. it is hte central partof your application. the better you understand what the company where you are apllying wants the better you can answer the question why you are exactly what they seek. Important here is to be honest. dont make claims you cant follow through instead list your strengths that apply and back them up with certificates or references if you have some. And dont try to get the application letter longer than max 2 pages. Most people wont read too long application letters. The font size schouldnt be to small either it should be easily readable. Letting a friend or realtive proofreadin git is always a good idea too.

And now good luck on the hunt :)