There is a lot of advice on the web to help prevent you blundering through the process or making faux pas. From the basics of job hunting through to special advice for mature job hunters, to how being a mum is a valuable set of skills and experience. Just type what you are looking for into Google or one of the other search engines out there.
One technique you might find useful is to make the job hunt your job in which you schedule tasks just as you would at work. Look into finding a mentor, someone you know and respect could be just as good as a remote but mega successful star.
Try putting your CV on Pinterest, and Tweeting about your job search.
Most companies have jobs on their website but you may have to hunt them down; look at the top or bottom of the page for "About Us", you may find a link on the "About" page. Have a look at all the big sites and get a feel of how they work and learn to identify less effective sites. Read articles and learn how to use any tools they have. Make notes!
Keep track of all the applications you've made, whether by automatic processes on these sites or by sending a CV, and note all the phone calls you make or receive and time and date of any interviews.
Despite the great technology, perhaps one of the best thing you can do is pick up the phone (don't forget to keep it charged up). There are also offline places to go to advice, from your local library and job centre to specialist advice for people returning from a long illness.
A lot of the advice online is from the USA, but many of the basic principles will apply in the UK as well.
Don't forget that there is a lot of free advice out there, so before you commit to paying for anything make sure you have done your homework and are going to get value for money.