If you have been out of work for a long period of time, it can be hard getting back in to it. People are out of work for a number of reasons. It may be that you have started a family and wanted to wait until the child started nursery or school before returning or it may be that you have had an illness which stopped you from working, whatever the reason, finding that all important job can be a nerve wrecking process.
You may not feel that you are qualified for the position your previously did, or it may be that this is the first job you are applying for so have no experience. If this is the case you can look to start a job that offers on the job training or even look at returning to education to acquire a qualification that will help you.
Your local careers office or job centre will be able to run through the options available to you and advise you on the best route back in to work. Sometimes they can even offer free training courses to get you started.