I have a very small bar. I sell beer liquor cigarettes and frozen pizza. I am soul proprietor and I file a schedule C at the end of the year. I would like to save money by doing my own sales tax and at the end of the year taxes.
To have POS and accounting software (i.e QuickBooks) is an ideal option for your case. But if you don't need any POS for now, you may go directly using QuickBooks. There are two options:
1. In term of TCO, consider QBD Pro edition. You may purchase one time license and get the cheaper price from a reseller.
2. In term of mobility, consider QBO Plus to have an inventory feature.
Hope it helps.