Waving to Marianne! I have asked all sorts of questions in the forum, gone off topic, bored others by showing off my granddaughter and relating details of a family wedding, ......... So far nobody has told me off or kicked me out.
I can fully understand your reluctance/worry about tackling a large project. Every time I want to try out something that is new to me, I make a few place mats. If they turn out well I give them away as gifts, if not I use them here and put plant pots on them. When I started quilting I would not start a very big project until I had done a smaller scale trial run.
About that sampler quilt: I think it's an ideal project for a beginner. You can make the blogs. When you have all your blogs you can lay them out on the floor (or a large table), or pin them to a design wall (or an old curtain), stand back and see if you like what you see. It's quite possible that you may want your quilt to be bigger. Then just add another row or two of blocks.
Just one warning: If you intend to quilt your sampler quilt on your domestic sewing machine, then make sure that you are happy with manipulating that size quilt under the machine. Personally, I quite happily quilt anything up to a lap quilt size myself, but if it's larger I save up and take the 'monster' to a longarm quilter.
I keep saying to myself that I really MUST practice 'quilt-as-you-go', so that the very large quilts are fine on my domestic machine too. But work and life keeps getting in the way. Ah well, when I eventually retire........
Finally starch: I have used it and, yes, it makes my piecing more accurate. But I loooove the feel of soft and tactile fabric, so most of the time I don't bother. And I never starch when the artist in me insists on making some sort of wallhanging that should not really be washed because of the types of fabrics or embellishments used.