re: Seeking Website Development Advice

You basically hire 3 back-office techies and no front sales. You will have a beautiful eCommerce but with no sales ;)

You should have a team of 4: 1 tech/dev (offshoring when it’s needed), 1 merchandiser (the ones who will make sure your Product Pages have the right content for SEO), 1 Ads/Search manager who will go after affiliates and manage keywords, and 1 Conversion/UX manager who will run A/B testing up to the point you’ll reach at least 5% of eCommerce conversion rate.

For the day-2-day, go for Trello or any kanban tasks tool. GitHub is cool if you plan to code a lot of custom exotic services. It should’nt happen, focus first on configuration and content.
And dont forget about a reliable webhosting. I think it's good to start from the decent and low cost hosting service like https://zomro.net/.
Their plans have many useful resources which are necessary for running a website successfully.
Prices are affordable and uptime is high. Cheers