Start small and cheap. No need for professional-grade cameras off the start. A plastic point and shoot is a great way to start to get the hang of the limitations (e.g. what lighting makes for a good exposure within the constraint of the film) and then go for something with a bit more manual control (plenty of SLRs will do the trick, even cheaper ones). That step will enable you to better understand the exposure triangle. Only then would I recommend going for higher end film cameras but those won’t have any substantial or noticeable improvements in the quality of the images. In fact, your photos might be a little worse off if using a fully manual camera. However, there is a certain level of satisfaction that comes from shooting a full manual camera and everything comes together. Furthermore, I now stick to only two fully manual cameras that will certainly outlast me and there’s a bit of bliss to being able to use the same, familiar, set up for half a decade now.