I have been playing guitar since I was 3. Easiest starter and the best way to learn theory etc is to start with acoustic guitar. If you are feeling good with chords etc, learn electric (power chords, bar chords) etc..
When you feel comfortable with those, bass comes REALLY easy. It will come easy because you will know scales, keys, strings, etc... GUITAR FIRST (ACOUSTIC)
You can do it.
But yes, definitely start with acoustic - even if you don't think it's the right decision, it will make all other instruments easier.