Welcome to the board!! - As Iceblossom said the choice of batting/wadding is a personal choice.Each type of batting gives the final quilt a different feel. I use Warm and Natural .... but the reason I do so, is that I purchase 40 yard rolls and have it on hand. If I am doing a baby quilt, I sometimes purchase bamboo. As to fabric, I am a fan of 100% cotton (again personal choice). Once the top is assembled, I layer it with the batting and the backing (again my choice is 100% cotton) and actually quilt it.
I might recommend over a period of time that you try a few different types / fiber content of what is available to you and after a while you will have a preference for how you want the quilt to feel.Also one sidebar comment ... a loosely quilted quilt ( one with less dense quilting) will be softer and hang differently from a more densely quilted item.