Some very good advice in the posts above.

As someone who trains people to prepare resumes and talk in interviews I just add a couple of points:

Find out exactly what they want you to do in the job, then say what you can do. Be prepared to talk during the interview about examples of how you have done those things.

Don't claim to be competent at anything unless you are. It's fine to say you have some idea, but you would like the chance to learn more skills.

Remember that you probably have numerous skills and abilities which don't show on your qualifications.
"I can use a computer, type a letter, read and understand a manual, do first-aid, drive a truck, comprehend and participate in a discussion, comprehend and follow instructions, give instructions for another person to follow" etc. These are important skills for getting along in a workplace.

Keep the work history to one page, dot points, in Word, giving basic information such as dates, names of employers and job titles.

A cover letter just tells the recruiter what job is involved and who you are. It should just state the employer's details, your details and the name of the job you are applying for. Include your full name, address, phone and email. No need to state your age, marital status, children etc.

Take a folder containing certificates, other qualifications etc and ask if the interviewer wants to see the originals.

Prepare some questions about the job and the workplace. It shows you are genuinely interested.

Say when you are available to start.

If you are offered a position, ask for a written offer listing employment conditions. If it's not written, then misunderstandings can result.

Good luck!