To start a business or not to start one?!?!

My husband wants me to work from home. So I can be with the kids/be involved with their school functions which I love. The ages are 9,4,and 2. I am thinking of getting a vinyl machine and start making custom t-shirts and selling them via etsy/facebook/eBay or something of that nature. I think it's really cool and I love the idea. I also am very afraid of taking that first step. 😔