Writing a Cover Letter
You can type it out or get help from someone and if you don't know how to write one then look up how to online. In some cases you may have to have your resume handwritten.
Writing a cover letter is hard to do cause you don't want it to not land you the job in any situation
Here is some links that can help you know how to dress for your interview.
Tips for a successful job interview 1.Eye Contact 2.No gum 3.Look Presentable 4. Handshakes