I would start with etsy as well, and maybe start building up a blog. Well known blogs I have seen lead to better business, but it is something you have to devote time to and I wouldn't limit yourself to just a certain type of fabric as you don't know how well that will sell. I have bought quite a few precuts on etsy. Mostly that is what I have bought off etsy and most online sites unless I have seen the line in person I might buy yardage. I would start small and see what is selling better so you can invest in that. I haven't seen as much of a high interest in civil war or reproduction fabrics in my area as I do asians, batiks, and traditional fabrics so you you should really research what is selling better.