Hmmm...so, you're saying that you want to become a trainer "just for fun and personal development"?
Honestly, I'm not sure that I like that idea. Now, the book list that you posted is a great list, and if you are applying the principles in those books (and this site) to your training and plan on applying it to your clients, then you'll be way ahead of a lot of trainers currently out there.
But, you don't seem to have the experience (only 1.5 years of training) or passion to make a really good trainer. What I mean is that knowledge is great, but without the ability to apply it, it's not worth much IMO.
And as far as the passion, think of it this way, would you want a doctor working on you who was just being a doctor for "fun and personal development"? Neither would I.
As a trainer you have a responsibility to your clients. They are paying you because they want to get results. Getting results out of them requires dedication both on their part and yours. You need to be willing to put a lot of time into designing and implimenting training programs specifically targeted at their individual goals and needs.
This means that you'll need to be able to adapt, troubleshoot, and expend a lot of energy in general. Training is not an easy profession, although if you are passionate about it, it is rewarding and fun.
I fear that the experience could end up leaving a bad taste in your mouth and a bad impression of trainers in the minds of your trainees.
One final thing to consider is that if you're really serious about seeing this through don't get the YMCA's certification. It's really only reconized by the Y, and like you stated above, they don't exactly promote solid time tested weight training advice.
You'd be better off getting certified through NSCA, ACSM, ACE, or AFAA. Those certifications will give you many more options in terms of where you can work, and tend to be at least better than the Y's.
In closing, this is just my personal opinion on the subject, and you can take it or leave it. Either way I wish you good luck.