Since you are the brand new to quilting and want help with color choice, I recommend choosing 3-4 fabrics for a simple pattern like rail fence or pinwheels.
1. Focus fabric you really like
2. A dark color from it.
3. A light color from it.
4. Optional binding color that's different .
when we say color, it doesn't mean solid, but how it 'reads. When you first see a fabric, what color do you see it as ? It might have tan and blue specks but read blue. Pink and green plaid but reads pink, etc. (squint if you can't decide).
decide.
Good luck. It gets easier with practice.