Measuring high voltage-current

Hello,
I'm new to this, I have a school project based on Arduino, I must measure the Voltage and Current of an electrical network AC ~230V ~15A, for the tension what to use, a transformer or a voltage divider? and for the current is the acs712 a good choice for the project?
I don't know where to start, I've done some project but never with 230v.
Thanks

https://openenergymonitor.org/emon/node/58

jremington:
How to build an arduino energy monitor | Archived Forum

Thank you