I started out with a book of quilt designs & information (borrowed from my daughter) and made my templates from sheets of gridded vinyl. Also, I used very cheap fabric ... all with the idea that I wouldn't be wasting a lot of $$$ if I didn't like making quilts.
I did like it very much and so started to accumulate notions & fabric, a bit at a time, so as to fit into my budget. Some of the notions & rulers I have not yet used and the months have turned into years.
You should have at least one good acrylic ruler and a beginner book (perhaps for a sampler quilt?). You can buy - frequently at half-price - a combo. pack with cutting board, rotary cutter and 24" x 6" ruler. I think you should have the book first; they always give a list of things you need.