what is the best way to get a job? i tried as a custodial officer but they said i was too skinny and young to get awarded the job but on the vacancy it said you have to be 18 or over and no qualification requirements needed

How could you be young and a "Senior" Member at the same time? Anyways, jobs should be easy to find based on the latest job report (read the financial news), we're near full-employment, which means its difficult for employers to find employees causing them to raise wages, so hang in there and be persistent, the right job will be there waiting for you.