After resetting entire POS, several things need to be set up in order so that you can work with the POS to enter your menu.

Many of these things don't need a final value, but just one entry so that you have an option to pick at a later step.

If you know what you are going to need, you can set things to their final value to make the rest of setup easier.

Complete initial setup in this order:

Add Physical Printers:
You will need to enable printers before you can set them for clients or as backup printers.
In general, you will need 1 per terminal, and likely 1 or 2 for the kitchen.

Add Printers:
These are jobs, like receipt, or kitchen, or salad or bar.
They do NOT always correspond to the same phyisical printers for each terminal.

Edit Client Terminal:
Enable terminals you will need or use.
By default, server, server2, reg1 and reg2 are enabled.
This is also where you can tell it to prompt mixers for mixed drinks as well as if the terminal has a keyboard or will be using an on screen keyboard.

Client Printers:
Setting the physical printers for each client to the respective jobs.
For example, on a machine that is behind the bar, its "bar" printer is likely the same as its receipt printer.
Where a machine at a waitress station would have its receipt printer next to it, and use the receipt printer of the behind bar machine as its "bar" printer.
For initial setup purposes, I set all printers of server to printer1.

Add Cash Drawers:
Enable cash drawers you will use, and set which device they are connected to.
Normally a machines receipt printer.

Client Home Page Setup:
You will likely want an open ticket list as well as your basic order type buttons on the screen.
I normally set up one screen (Default) and later make changes to others as needed.
Other common buttons would be Punch Out, Open Drawer and a Calculator.

Getting ready to add your first menu item:

Add Sales Categories:
How much do you want to break up sales category reporting?
You can go from very basic, with 1 category called "Sales" and put everything there, or you can break it up into Entree, Salad, sides, Appetizers, Beer, Liquor, Soft Drink and so on.

Add Food Screens:
Starting basic and filling in later is a good strategy here.
"Main", "Mixed Drinks" and "Beer" seems like a good start for many installs.  

Adding your first food item:
Starting with a very simple food item.
In this example, we will use soft drink.
In the first page of the "Add New Food Item" form, under name enter "Soft Drink".
If we don't put anything in the Button or Print captions, they will auto-fill with whatever is in the name field when we save.
Now that our item has a name, we can save and move on to the next screen and assign it to a sales category.
Pick a sales category in the left list, and it will move to the right list.
If the category you want isn't listed, you can use the add/edit button above the left list to add an additional sales category if you wish.
In this case, pick "Soft Drink" or "Beverage" so it shows as 100% and then hit save.
We need to know what tax rates apply to our soft drink, and if it is included in the price or not.
By default, the POS is set at a 20% tax rate so that you don't forget to change it.
If we know that we want our soft drink to cost $2 and add tax to that, all we have to do is pick our sales tax rate in the left list so that it appears in the right list, and click save.
IF we wanted our $2 soft drink to include the tax, check the tax included button above the right list.

At this point, the basics of our soft drink are done, and it takes us to the edit food item form so we can proceed in any direction we like.
There really isn't anything to our soft drink other than needing to  price it and put it on the menu screen.
Setting prices: Click on the prices button, then "All Base". In the base price box, enter 2.00
Adding it to a screen: Click on food item screens at the bottom to get to the "Set Menu Screens" form. At the top left are your food screens. Pick one of them and you will see it highlight in green and you will the grid of the screen in the main window. On the right, we can use the triangle by "None" and click it to expand the group. Now you will see Soft Drink. Simply drag and drop soft drink to a button on the screen. When you are done, click close. This takes you back to the previous window. We don't need to edit our soft drink any more, so we can close or log out.

If you start a cash sale, assign the drawer to yourself, and go to the food screen, you will now see Soft Drink on your screen and can ring them up for $2 each.