I have a clear ruler, similar to this.. it's my ride or die.

https://www.amazon.com/Fiskars-12-87577097J-Acrylic-Ruler-6x24/dp/B002XNULX8/ref=zg_bs_2933775011_1?_encoding=UTF8&psc=1&refRID=PPYQTJB0D80BDXQFJETX

Especially helpful when paired with that rotary cutter you're getting.