I did a few things to make my own. I found a website that has pre-planned preschool curriculum for free. It shows you the monthly curriculum and has hand-outs and worksheets to print out. I print out the handouts and put them inside plastic sheet protectors and give them dry-erase markers to work on them with. Some sheets are so easy, like the letter of the day and the kids color it in and cut out things that start with that letter and glue them on, that I don't bother to print them. I bought the brown kinder paper with lines (the kind they practice printing on), draw the letter with a marker and use that instead. Simple but works. The website is
http://preschoolpalace.org.
I used to use that exclusively and then started buying books on curriculum. I loved The Complete Daily Curriculum for Early Childhood and The Weekly Curriculum 52 Complete Preschool Themes. I do the same things with those worksheets. When were done with the worksheets, I file them by category.
Since you are just starting out I would plan the curriculum 1 week at a time so that you only have to buy a few things at a time. Eventually you'll have most of the stuff on hand and won't even need to buy anything. Remember that not all of the curriculum is crafts and art. A lot of it is singing, dance, games, movement, etc. We're doing dinosaurs this week and I printed out a sheet with dinos on it, cut them out and glued them onto index cards. Then we played memory, go fish, sang songs about them and learned about the dinosaurs on the cards by looking them up online. All that cost me was the use of a sheet of paper, some ink, and some glue. Tomorrow we're going on a dino dig. I'm burying the dinos in the sand at the park and giving the kids brushes and they're going to excavate. All that cost was the price of some $ store dinos which I already had and some $ store house paint brushes.
Don't be afraid to get creative and remember that even when you buy your curriculum and it comes with supplies, some supples are still required to be purchased on your own.