I've been writing and recording music/songs for a long, long time, and of course, my "process" has changed over the years. One aspect of my process that has remained constant though, is that when starting a new work, I always start with something musical - something on a guitar, some sound in my DAW or synth, or some drum/percussion pattern or loop.
When I start with something on my acoustic, I also finish it on my acoustic. By that I mean, I come up with the complete acoustic guitar part and the complete lead vocal arrangement (which also means I complete the lyric) before I start any recording or do further arranging for the song. Sometimes I'll record it as a guitar+vocal 1+1 and leave it that way as a finished recording, and sometimes I enhance the guitar+vocal 1+1 by adding further instruments/sounds and/or vocals to the arrangement. How do I decide what to add to the arrangement and when to add it? I think that probably varies from song to song. But I'm sure it significantly involves a lot of trial and error guided by my musical intuition, which in turn, is probably grounded in years of experience listening to good music and writing and recording my own. In other words, I'll try this or that, and if I like what I hear, then I keep it and move on to what else might sound good to me., until I get to the point when I consider it done . . . for the time being anyway.
When I start a song with a sound in my DAW, then by default I'll record what I'm doing with that sound. So I'm starting with an initial recording of something musical, and as I continue the process for that work, there really are no distinctly separate writing, arranging, or recording phases. It all kind of meshes together. And again, it involves trying this and that and listening to the results.
I've been doing this long enough to believe that what I might imagine is most often a mirage tempting me to go down a rabbit hole trying to bring it into reality. What truly inspires me, is how something actually sounds to me - not something I only "hear in my head." That includes lyrics. A big factor in deciding what words I want to sing, is how the words sound in the arrangement as I sing them in various ways.
I've been doing this musical creativity thing for so long that my process is now pretty efficient, and many, if not most of my songs, take less than 48 hours from that first musical snippet as a start to a fully produced recording of a finished song, and I often I finish in the same "session" that I started, because once I do start, I get a bit focused on it - perhaps obsessively so. Even the trial and error aspect of my process is fairly efficient. I know almost immediately when something sounds good and when something doesn't, and when something that sounds pretty good might sound even better with a change. I also know when I sing words whether they are conveying what I want to convey in the way I want to convey it, and I know when I'm not meeting that goal. For example, "I want to leave" sounds okay, but if I sang "I have to go" and held "go" with that long "o" vowel sound, and added harmonies, that would sound killer and better convey my emotions.
* Disclaimer. The one instrument sound that I do rely on what I imagine it sounding like during my process until I actually record it, is my singing voice. It's just too physically tiring (and embarrassing if another is within earshot) for me to actual do a bunch of singing out loud when I'm trying to come up with a vocal melody and lyrics. I know my voice pretty well and what it will sound like when I sing out loud. But I confess, sometimes I am surprised when I actually go to record my vocals - Shit! It's out of my range! <heh-heh>
I doubt any of this is of any use to you, Mahesh. So let me close by saying this. However you arrange and mix a recording of one of your songs, always make sure your singing is center stage. You're a fine acoustic player, Bro. But when you play the instrument of your voice, you're a virtuoso, and the sound is glorious.
David