Hi Alon!

Anything you learn on the acoustic can be applied to the electric, so I wouldn't worry too much about not having an electric guitar at this point. If anything, when you do get one, it will just feel a lot easier since the neck is smaller and the strings lighter.

Of course you won't get the rocking overdrive sound from your acoustic, but sometimes it can be good to practice this stuff clean, so you hear what you're doing.

After a while though, it might be a good idea to get an electric guitar if you're into rock. Muting techniques with lots of distortion, as well as bending are some areas that are a bit difficult to cover on the acoustic guitar.

/Ben