Since I'm 22 and just starting out, if I wanted to build a simple, balanced, and diversified starter portfolio using only ETFs in the U.S. market, which specific ETFs and what percentage split should I use? And why are those the best choices for a beginner with a long time horizon?

Hi
I have been running a profitable furniture business for the past 3 years. Now i want to grow my business online through facebook and instagram. So tell me, how can i draw the customers online with a limited capital? How should I determine what products to sell, establish a web store, and effectively market my business? What are the possible challenges I can see in this shift?