If you're thinking a couple 20-30 min movies on your own... that will be very very very tough. I would say set your sights on making a nice 8-10 min short created over the span of a year or two. Something to look at that I found really cool as an example of solo (or duo) projects would be "Meet Meline" www.meetmeline.com. This is two people over years creating a single short film of very high quality.