Hi Jack!
I think I'm in sort of the same spot. I've started to believe I might be able to make something similar to stoner rock on my own. I play in two bands at the moment but it's mostly like going to the gym, only covers. I play guitar, I sing, we drink coffee. Just fun.
So I've started to record bass(with kick drum as metronome). Just intro and verse. I got all the guitar stuff in my head, no lyrics yet, and add drum by drum in midi. One drum after the other, just hitting the keys on my Akai. Most hits are slightly off beat, maybe 5-20ms +/- on every hit. At the moment I've done kick, tom, snare and hi-hat for about 16 bars. There is no beauty in my midi sound samples but it sounds a whole lot better than when I created drums by drawing blocks in the midi instrument track (Studio One).
My advice is that you listen to some songs that go in the same direction as you want with this band. Some bands have more of a wall of sound than single instruments. Think the chorus of Band of Horses 'The Funeral'(post-post-indie?). Some later White Stripes uses the same concept of multi layer sound a la Billy Corgan to occupy all the space in the room. Another style that does the opposite is more directed towards background instruments and lead vox/git, maybe The Strokes(post-garage?) is a good example. Since I live in a country with two capitols I'd recommend listening to the whole Gothemburg 90's indie scene (after the death scene). You got STOOL, Bad Cash Quartet, Broder Daniel, maybe throw in a bit of Refused in the mix.
You got the voice. You got the songwriting. Now let's get you a band! [Insert cheerful picture of 'The unBreakable' Kimmy Schmidt]
All the best,
Martin