If you are having your film processed at a commercial lab, the easiest way is to have the film scanned at the time of processing. Probably the cheapest way, too, at least in the short term.
Otherwise, the answer depends on your answers to questions like:
- b&w or color negatives?
- what format - 35mm or something else?
- what do you want to with the digital files - share on social media, make prints, or something else?
- do you already own a digital camera?