People think it's really hard to start your own business, but it's really not. You can get rolling with your business with in minutes and have the whole foundation setup with in hours. The first step is the hardest. Deciding what business to dive into can be tricky. The best business is the one that you do anyway. What I mean is, do some thing you love to do or you habitually do and monetize it (put a price tag on it). If your going to do it anyway, you might as well get paid for it.
EINs (Employee Identification Number) come in handy for your tax purposes and establishing accounts with companies for wholesale purchases where your purchases are tax exempt. Tax exempt means you won't have to pay taxes on your business purchases. An EIN is great for building up your business credit. Entities such as Dun and Bradstreet will track your credit performance for the entire business world to see. This way when you apply for loans, company credit, new accounts, you will have live proof. They are also ideal for work from home businesses.
If your business is a LLC or Corporation, you will have a Federal Tax ID number and you will use that for your business transactions. If you are a Sole Proprietor, which means you are the only employee in the company, your social security number or your EIN can be used for purchases, loans, taxes, etc...
Having a great personal credit score in a Sole Proprietorship is very important since your new business doesn't have any established credit under your EIN. You won't be able to get any loans or major credit cards worth their salt.
If you have good personal credit, you can make loans and get the cards while you build up the credit on your EIN and then use that number for everything. It's all a numbers game. Your can literally have your EIN in minutes.