I would recommend time trials as well. Whenever I stop the time trials, the incentive for keeping up the training disappears and a week of non cycling slips into a month or more.Why not give it a go? Time trial is an easy way to start, gives you another reason to ride.
As far as distances are concerned, I believe in "less is more". Far better to do a 30-60 min ride 3 or 4 times a week, than it is to do a longer ride at weekends.