In reply to MuckyMorris & CrimpI think any training of any sort given our fledgling climber is naive to the ways of the weight will see benefits however there a couple of tweaks you can make this early on that are not too onerous that should set you up to make the most of your time:
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Bands are a good option and are cheap, the downside is the resistance is very high when fully stretched out and low at the top of a pull-up. As such there is a tendency to miss out on using the correct form for retracting and depressing the shoulder blade (scapula) in place prior to initiating the pull up.
This video will give you other types of progressions into the key pulling exercises. At 45secs they show you the shoulder locking sequence. You can train this independently from the pull up by hanging off the bar and performing repetitions (reps), start adding weight via a belt or harness if you can do 10 reps of 3- 5 sets, this will set you in good stead for having strong shoulders for when you want to take your pull-ups further.
This video shows you the correct from for the pull up and common mistakes.
Now if you have never trained before it's worth considering what type of build you are along the body type spectrum as explained in outline in the article below. Few people are absolutely one type, most fall in between types. It does go some way to helping figuring out what your likely to respond to best in terms of resistance (reps, sets and intensity), number of days to train and life style.
http://www.coachmag.co.uk/lifestyle/4511/ectomorph-endomorph-or-mesomorph-w...
If you can stick to doing these exercises 2-3 times a week, you should see gains within 2-3 weeks just based on your body understanding what your asking it to do, after 6-8 weeks you should start to gain muscle.
I would add a bad diet, stress and poor sleep with reduce or ruin any gains from training so sort them out as part of your new training plan.
Post edited at 19:45