Yes you are on the right track. Using examples through reflective diary should provide you with excellent working practice evidence.
To show a variety of evidence, for this unit, you can also use your own training & development records. As long as you have reflected on the training and said what you took away with you, from the course, and how you used information from the training in your work. If you have not reflected on your training ... write up a reflective a/c relating to a specific training you have attended.
Have a look at the forum EY downloadable resources, on this site .. very useful info here. Click forum button at left hand side - top of this page.
Don't worry too much about 1st obs and not much covered, I am sure your assessor picked up other evidence which you can use later to other units.
Assessors need to see consistency of practice, therefore need more than one observation, not the same one each time. After the next observation I am sure you will start seeing more ticked off.
Keep that journal going - as long as you are evaluating this will give you excellent evidence across your award
