I believe that the best way to begin with electrical play is the TENS unit. (TENS means Transcutaneous electrical nerve stimulation.) A Tens unit is a box you use to generate an electrical pulse which is used in medicine for pain control.
We don’t use it for that.
Instead, we use it to stimulate the muscles and skin of our partners. The frequency of the pulses and the intensity can be adjusted from so that you can go to very pleasurable to quite intense. It is perhaps the easiest and safest, while allowing for a wide range of sensations. You can even find attachments that will allow you to provide some unique sensations.
Before you begin electrical play, keep in mind that this is advance play, even with a toy like this. Get help from your local community. Never use it on the head, and be very careful to not use it near the hear (particularly if you use it across the heart). I would urge you to buy and read Juice first before you do anything electrical, or find a mentor to teach you hands on.
Good luck and have fun.