I'm an old guy, 51, about 250lbs and live in a town on the side of an extinct volcano in Costa Rica. The town really doesn't have any level ground so I am riding up the easiest hill in town which really only gets me about half way to the top of the town (it takes me about 15 to 20 minutes for me to make it up the hill). I rode up twice this morning at a very, very slow pace. It sure was fun going down after the climbs. The second time I ended up in the easiest gears and just barely made it to the top of the hill. My legs are basically jelly when I finish a 30 to 45 minute ride. My plan is to just keep doing easy hills for a while until I can go up the steeper ones. There are a couple of nice gravel roads out of town into the countryside that I am looking forward to being able to ride. I am planning on riding longer but really can't yet. How long should I be riding every day to build up my legs and lungs? Should I be riding every day or do I need rest days? I read about all these people here on this website writing about long training rides, so how do long, fast, flat rides compare in energy usage to going slowly up hill? Lots of questions I know but it seems we have lots of experienced riders that might be able to help me get started properly. Thanks in advance.