I am a newbie, having brought my first road bike last week! I have done a couple of short rides (5-10km) to try and toughen up the butt area and will hopefully get used to the sit bone and "other area" pain soon enough.

I rode 20km yesterday in roughly just over an hour on an open country road. I am getting used to shifting gears and braking and am feeling a lot more confident on the bike now.
I am wondering if anyone has any tips on a suitable training regime to help me progress to riding a distance of say 50-60km by the end of the year? At this early stage should I be focussing on distance or time? I hope to get a computer soon to measure cadence etc as I know this is important, but any help or advice anyone can provide on how to first start out on a road bike (without a computer to assist) would be much appreciated!
Cheers
Stacka