Hell yeah an0va, that's great advice. I wish I'd had that explanation when I first got started tracking.
Being in a band is all about finding people who actually want to play music. Not people looking to get laid, not dudes who want to "rockstar out bro!" not that guy who wants to be the coolest kid on the block, but people who are musicians because they have an honest drive to make music for it's own sake. If you can find four people in your area with this attitude, who share genre preferences, consider yourself very lucky. (When you add other limitations like "Not an egotistical asshole" or "can actually play an instrument" it becomes more like three, or even two in all honesty.) I have been in bands with some amazing people and some absolute turds. Sometimes it's easier to keep the hardworking, dedicated musician who has nothing in common with you than the totally awesome guy who never practices and just shows up to look cool to his non-musician friends.
After personnel is sorted out, the band dynamics will form themselves in time. Usually one person will emerge as the principal songwriter and the others will either jive with that or bail. Sometimes that can be messy and uncomfortable, but it's a natural part of the process. I have been on both ends of that situation a few times, and sometimes bowing out gracefully is the best option. It really helps to be flexible and open minded in that situation. In very rare circumstances one might find a person that they can fully collaborate on writing with. I have only found that once in my career as a musician, and it made for the best band experience and the best music I have yet to produce. If you find that person, cherish your relationship and give it your all to keep it as friendly and informal as possible.
As far as writing better music, preforming well and progressing as a unit, there is no secret at all. You can take lessons, read books on your instrument, spend money on better/more reliable gear and get the collective effervescence of the band going by being truly into it. All that stuff is great and will help in superficial ways, but the truth is, none of that shit matters at all if you don't practice. Practice every day you can possibly imagine practicing. Make a schedule and write it out on calendars for each bandmate... At the height of my best live band we were practicing 5-7 days a week. 2-4 hours a day. We made this work because we had a dedicated practice space, the three of us had 9-5 jobs and lived within 45 minutes bus-distance from each other. Did we get sick of each other? Yeah, but not to the point of violence. Did we get bored to death of the same setlist? Yeah, really quickly, actually. Was it all worth it to go on stage and absolutely floor audiences every time? Yup.
TLDR: Q: How can we be more productive? A: Practice as much as possible.