its definetly a matter of personal preference, but i would say that picking up acoustic or classical first is essential before picking up your electric axe.
the amazing thing is, when im out of ideas or inspiration, i turn to my acoustic! its weird, but it does really happen.
when you start out on acoustic guitars, they give you an idea on what a guitar looks and sounds like. theres the parts to recognize, the chords, the strumming patterns, basic fingerpicking and what not. then when you move on to electric, it will take you a shorter time being familiarised with
if you play on an electric first......nothing wrong with that actually, but the disadvantage is that you won't be exposed to guitar playing that much, im not sure how to say it but you'll get my drift soon.
okay, a living example is when i picked up electric after roughly half a year. at that time my chords and strumming patterns where okay, but i lacked the technique of fingerpicking. still to this day im weak at it, due to my attitude when i thought that i could rock the guitar world with just a few chords and some basic techniques. regretted it alot.
lets just you will benefit from learning acoustic first. once you have grasped the basics, electric guitar will be an easier for you to understand.