You need a web presence. More and more people turn to search engines when looking for a product or a service. If you don't come up in a web search, you might as well not exist.
If you don't know where to start, we suggest Weebly. Hover over the link for a description.
Do you have an awesome idea for a business? Is it awesome enough that strangers on the internet will give you money for it? If so, prance out your best pitch and try to wrangle some start up capital from Kickstarter. Set a monetary goal, and if enough people pledge money to meet the goal, the money is yours. You'll have to give people incentives to donate, so think about prizes and giveaways. Someone, somewhere wants a sandwich named after them and will pay to make that dream come true.
People expect to be able to pay with their credit and debit cards, but what if you're out and away from the office? What if you don't have a traditional registed with a card scanner? Square to the rescue. This handy gadget turns your smartphone or iPad into a tiny mobile register, for a flat rate of 2.75% per transaction.
You're going to want your documents available no matter where you're working, whether you're out and about or just working at a different computer. Invoices, estimates, budgeting spreadsheets, and to-do lists should never be far away. With Google Drive, everything you need is available wherever there's wifi or smartphone service. You can even share documents with employees and work on them at the same time, perfect for brainstorming remotely or hashing out next year's budget.
Sound and free business advice, written and collected by those who have first-hand experience. It's difficult to encapsulate all the great resources on this site, but their "Business Plan Assist" program deserves a special mention. Nothing helps ensure success like a solid business plan, and if you don't have one you'd better get cracking. The nice folks at SCORE can help.