There are tutorials available about how to get an accurate sewn 1/4 inch seam both here and on the web. There may also be a video on the subject at You Tube as well as some quilt shops online may have some instructions.
If after reading through some of the tutorials you still have questions please post them so we can help with the learning curve of the scant 1/4 inch and any other issues.
Glad to have you here and quilting with us.
Pam M