New writers these days are instantly awash in all kinds of advice (some even useful) but none is better, I humbly suggest, than that you don’t have to master everything all at once. This is true of writing craft, but it’s especially true of the business side of the game, from website development to marketing.
When I started writing professionally, I didn’t know much about the business, but I knew I needed to build a newsletter so that I’d have a list of people I could get news out to later when I had novels and such to sell.
At the Writers of the Future workshop, Mike Resnick gave me hell about not belonging to my local writer’s guild, and it was good advice. The Houston Writers Guild was at something of a zenith of activity at the time and I got invited to participate in a number of appearances from which I collected a tiny buy growing list of reader email addresses.