Hi NicoVari,
Using the DAQmx Create Channel VI, you can select an Analog Current Input. You can then specify the shunt resistor your have used (Ohm). You can then use the DAQmx Read VI to read the current.
What do you mean by "what type of signal should I consider once I have the current converted?" ?
There is information about Measuring and Generating Current HERE.
There is an example on how to input a single Current reading on an Analog Input Channel HERE.
There is an example on how to Continuously Acquire 0-20mA Current Samples- Software Timed HERE.
Let me know how you get on and if you have any more questions
Kind Regards