Solution: Canva. There are tons of free templates - ample options to do most of what you need to do for free. Or you can upgrade to premium content without a subscription - most images, custom backgrounds, etc. are only $1. Downloads as a .PNG image file or a .PDF are free.
I've been using Canva to make this ol' blog purty, and I plan to use it oodles for the kiddo's upcoming birthday party. I'm not a graphic artist, but I used to spend lots of time attempting to create party printables myself. Using Canva has slashed that time to next to nothing. Give it a try. I promise, it's awesome.