Are you near a quilt shop? I would use a simpler pattern. I would not make a quilt with sashing for my first quilt "on my own". Sashing can be tricky to get just right. Sashing is the white fabric between the blocks on the quilt you showed us. If you were in a beginners class you would be able to get help on lots of issues and be encouraged by other newbies too. Have you used a rotary cutter before? Do you have a machine with a 1/4" foot? Do you know the difference between ironing and pressing? I learned so much from my 2nd quilting class and I have used those same golden nuggets to teach friends here in my home. I hope you heal up well and don't push ourself too hard.
As far as fabric online I have a friend that bought from Thousands of blots. com and she was thrilled. Lots of batiks and it all comes to you labled and beautifully wrapped in tissue. They also are very nice to speak with!
Take care!