First train for aerobic fitness, exercise bike for a month or so then some rowing building up to maxing out on a 10 minute row.
While you're doing this start doing paired exercises that is pro and antagonist exercises with low weights eg about 30% of your max and say 6 to 8 sets of 25 repitions. This will strengthen your tendons, ligaments etc Muscle grows much faster than the connective tissue can cope with the extra power and strength.
Do this for a month minimum perhaps more and then gradually increase the weight to about 60% of the max reducing the reps to say 12 and in four sets. Remember to keep the exercise paired.
Do this for at least a month, then you're probably ready for power.
You have two sorts of muscle fibre (non cardiac) fast and slow twitch. In basic terms fast twitch are fat power fibres and slow are thin stamina fibres.
Power is about work over time, and can be delivered by either recruitment of slow twich fibres, so the body 'fires' more shots at the same time or by development of fast twitch fibres.
Since you probably don't want to bulk up like a power lifter you're probably better advised to try and develop more power via recruitment, to do this get the muscle deeply tired by lifting weights at say 50% of max in sets of 20, if you can't get to 20 reduce the weight until you can complete say three sets. Once you fail with fatigue i.e. get to about 15 rest for five minutes then up the weight by say 10 kg and try to get to 5 reps. If you can do this easily you gave up on the previous phase too easily.
This will train the body not to build heavy fast twitch muscle fibre that will fail in 20 seconds (and how many problems are sub 20 second) but recruit a higher % of the slow twitch fibres to deliver the power.
Once you've built up the base i.e. % of max used to tire your muscles to say 75% you're ready for training power on a woody. I'd suggest that going straight onto a woody without actually building the muscle mass, strengthening the joints and developing the recruitment is a waste of time and more likely to lead to injury rather than long term gain.
PS this is all from memory and my first degree 20 years ago, and I got a 'sport'smans 2.2' as I spent most of the time out climbing etc rather than in lectures.
