Training schedule for endurance events

I looking for some advice on exercise and training programs to help me prepare for some planned endurance events later in the year. I'm currently commuting everyday (4 miles) at a good pace and riding a couple of 20 milers a week in the evening (all time allows with work and young family!). At the weekends i'm trying to build up road mileage and covering 50 miles in about 4 hours(conti speed kings - not slicks!). My big problem seems to be maintaining a steady pace on the road - i'm suffering with knee pain (ride spds with good bike/seat set-up) and lack of push from my legs even though my breathing and heart rate are fine. Guess i need to build strength over fitness but i want to follow a set plan to be ready for my first 100 mile road route in june. Any help/advice would be appreciated.
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Regards training if your event is in June you still have along way to go so don't break your kneck just yet your knee pain could be from doing too much too soon so maybe look at easing off slightly and building your endurance over a longer period putting in regular consistent rides where you feel like you are improving in power and 'steady pace'.
http://www.mtb-marathon.co.uk/training/8.php