Also, some hospitals don't hire LPN's. You might want to check local job postings at hospitals to see if they do. Where I work, LPN's do the "most hands on work"- like administer meds (minus IV pushes), do dressing changes, measure Input and Output, finger sticks. The RN's are responsible for assessing the patient, calling the doctor, doing paperwork- they seem to have less hands on experience with the patient, but you have more responsibility. This is also assuming that you have an LPN and RN on a team (which you both care for 8-9 patients). If you dont have an LPN, you have to do all the work yourself, but you have a smaller amount of patients to take care of.
You can also become an aid (or Patient Care Technician/Assistant, each place calls it differently) instead of being a CNA (which requires training, usually 1-2 months), but I would also check with area hospitals to see if they hire aids or just CNAs. By being an aid or CNA, you'll be able to see how you like the field, and what exactly the roles are of RN and LPN's. A majority of hospitals have a minor "Training course" to be an aid. At my hospital it was 2 3-hour evenings where they teach you how to move a patient, how to check their blood glucose level, how to take vital signs, how to make a bed, stuff like that.
If you become an LPN, you can become an RN by taking additional courses at an accredited school. A lot of LPN's I know, want to go back (or are in school) to become an LPN, since their roles are phasing out.