Any adult who looks after another person's child for more than two hours on any one day in a location other than the child's home (so excluding most babysitters and nannies) needs to register with Ofsted – it's not a particularly complicated process but does include medical, criminal and domestic safety checks. Nannies can look after the children of up to two sets of parents, in one of their home environments, without being Ofsted-registered.
This list offers some great ideas and inspiration for folks looking to increase their income. There’s really no reason that anyone with some ambition, a good work ethic, and “people skills” can’t earn some extra money (or a full-time income) pursuing some of these self-employment ideas. I’ve done a little research, myself, to compile a list of small business ideas, and stumbled upon a few possibilities which you didn’t cover:
I no longer build WordPress sites, but back in the day I easily built over 100 of them and worked on even more. I was an OG WordPress adoptor and loved building websites for anyone who needed one. I got my early clients from Craigslist and eLance (now UpWork) and started building websites for law offices, consulting firms, non-profits, churches, real estate companies, and e-commerce startups.
If you're operating your business as a sole proprietorship in the United States, you don't technically need an EIN for the business – you can file taxes for your business along with your personal taxes. However, you may want one if you want to open a bank account for your business, or if you don't want your Social Security number to appear on business documents.
As for other tips, all I can say is “a penny saved is a penny earned”. If you are running out of ideas to make money, start saving. Some quick “low hanging fruit” tips to save some quick cash include – switch to MetroPCS or Boost for cellphone (I only pay $20/month), switch auto insurance to Insurance Panda ($25/month), and start using GasBuddy (saves me like $100/month at least. I drive a lot).