When trying to electronically sign, you won’t need anything other than the device that you plan to sign with. Every company will be able to help with setting up an electronic signature, and most companies have multiple ways to sign.
If you’re trying to create the same signature that you would use when signing paper documents, you might need a stylus and a touchscreen device (Android, iOS, etc.) in order to sign electronically. However, these tools aren’t strictly necessary to create a digital signature or a signed document.