I think being eclectic is bad when you're just starting out.
My other advice is to start writing songs and singing right away.
I had previously been in the band the Modern Lovers with Jonathan Richman.
I've become increasingly confidant in following intuitions ahead of thoughts as I produce more records.
I think that technology has both introduced new sounds but also allowed an increasingly painterly approach to recording music as you can now paint over what you've done and more and more refine an existing performance.
For a young band about to make a record, make sure you get the vocals right.