Nice quick video on setting up Cura for your Tevo Flash 3d printer.
I'm using the latest Cura 3.6 which has some Tevo profiles already and with a simple tweak you will be up and running in no time.
Please comment if you have suggestions for better settings and i will update this text :)
How to setup Cura for Tevo Flash...
Click Settings, printer, add printer
Choose Other, "Tevo Black Widow"
Click Settings, Printer, Manage Printers
Click "Tevo Black Widow", Machine settings
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Printer Settings
X 240
Y 240
Z 250
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Click Settings, Printer, Manage Printers
Click "Tevo Black Widow", Rename
Set as "Tevo Flash"
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Happy Printing :)