Hi and Welcome!
I don't pre-wash fabrics.
You might try a sample block first before cutting all of your fabrics. That way you can see the color placement in the block. It can help you determine if there are any issues in the pattern directions too. There is time and fabric to make adjustments.
For a first quilt look at the double slice layer cake. You don't need a layer cake though since you can cut your fabrics to size. The piecing is straight seam piecing. Plus there are only a few intersections to match.
Master the 1/4 inch seam and the cutting processes first. Then proceed to "Y" seams and curves.
https://www.youtube.com/watch?v=HTOGt4cRdJE
Good luck!