New project using BarCode Scanner, WIFI or Ethernet and read/write to SD

I am looking at using Arduino for a solution I am working on to have Arduino sit between a barcode scanner and Printer.

I have never done any microcontroller programming or configurations before so am totally new at this.

I will probably need about 70KB memory to hold my clients lookup table so am looking at the Arduino DUE microcontroller since it has 96kb sram.

I was wondering can I use the MKR1000 which has the wireless lan with the Arduino Due?

What is the best SD or MICROSD to use with Arduino Due?

Did you look at ESP8266 boards, like the $4 WeMos D1 mini (and others).
WiFi, plenty of room for a lookup table (1Mb), and internal flash (no SD card needed).

CijiSolutionsLLC:
I have never done any microcontroller programming or configurations before so am totally new at this.

Then you might be in for a rough ride. Get some experience with an Uno first.
Leo..