You have got a cutting mat haven't you?
Rotary cutters can make an awful mess of your dining table.
Templates are something you can manage without, certainly at the beginning. The simple shapes you need to start with can be cut with a ruler.
I would say a cutting mat, a rotary cutter and a 6 x 24 ruler with clear markings are your best starting point. Oh and some fabric of course.
Best of luck, you will soon be addicted. There are lots of good tutorials around, there are ones on here, also YouTube. Craftsy has some free ones to get you started.
This place is a fantastic knowledge base.