Mona, Welcome and this is a great place to be. You will learn lots from everyone with the wealth of knowledge that is shared here and all the wonderful people.

I have found the missouri quiliting company to be helpful at times. Short and informative tutorials. Also Youtube has some good insturctions. Missouri quilting company shows you some different ways to lay out the squares to make pin wheels larger triangles etc. you might find this helpful.
www.missouriequiltco.com check out the daily specials too. They have some good ones.
http://tutorials.missouriquiltco.com/

Hello from North Carolina.

Welcome. Check out quilt patterns in books, the library has a ton of them, and online. There are hundreds of patterns out there and they will give you the yardage needed. It is probably the easiest way for a beginner. I started the hard way, reinventing the wheel, so I am learning too.

Welcome Mona!!!!!!!!!!!
And questions are always welcomed and answered. Lots of talented people here :D:D

Welcome from Michigan.

Hello Mona, welcome from another Michiganian!

Hello Mona, welcome from another Michiganian!

Hello, welcome and happy quilting from Germany!

welcome from Michigan most patterns will have requirements for different sizes if not a good quilt shop will answer your question i am new to quilting too so I get confused so If size isn't on Pattern i ask at Quilt Store

Welcome from Ireland.