If you prefer apps, I use my Google calander for scheduling, and Hurdlr [
driver.app.link] for expenses, receipts, income tracking, milage tracking, and tax tracking. Hurdlr does 90% of this stuff automatically if you link your Paypal and bank account. The only thing it doesn't do is track reimbursements.
Having said that, I used the spreadsheet mentioned above for many hears and love it.