1. Create your account and choose a plan. Sign up for QuickBooks Online and pick a plan based on what you actually need, invoicing and basic reporting, or inventory, project profitability, and more users. You can upgrade later, so don't over-buy on day one.
2. Enter your company details. Go to Settings > Account and Settings and fill in your legal business name, industry, EIN, and fiscal year. QuickBooks uses your industry selection to suggest a starting chart of accounts, so pick the closest match even if it's not exact.
3. Link your bank and credit card accounts. Under Transactions > Bank Transactions, link each account you use for the business. QuickBooks pulls in roughly 90 days of transaction history automatically once connected, saving you from entering everything by hand.
4. Review and adjust your chart of accounts. QuickBooks sets up a default list of accounts based on your industry. Go through it once, rename anything that doesn't match how you actually talk about your business, and add anything genuinely missing, but resist creating a new account for every small thing.
5. Add your customers, vendors, and products or services. Under Sales > Customers and Expenses > Vendors, add who you bill and who you pay. Under Sales > Products and Services, add what you sell so invoices pull in pricing automatically instead of you typing it every time.
6. Set your invoice defaults and sales tax, if you need it. Under Account and Settings > Sales, set your default terms and invoice template. If you charge sales tax, turn it on under Taxes and set it up for the locations where you're required to collect.