A few questions.
Why does Celorza flip out when someone post a link to a website that isn't NP. I suppose it is against the rules of some type but I never knew it was such an issue.
Why would you neg someone for anything, at all, unless they are being a blatant @$$hat.
I think it is fine to take some "PWO"s at 16. I would recommend something basic or making your own. Creatine and Beta Alanine are two of the ones I enjoy. You could look into Condense which is pretty basic as far as PWO but works well, and it's cheap, and you can add your own creatine. Honestly you could be messing with worse stuff, glad you are asking about PWO and not something else.
I understand the whole forum view on the 18+, but we have got to realize that some 18 year olds aren't as mature as some 16 y/o's and vice versa. That said, I think it is important to make some natty gains when you are new to lifting. The OP has been lifting 8-9 months. I would suggest he keep lifting a while longer before working into the supplement world. You gain fast enough your first 1-2 years that you don't really need supplements unless you are a competitive athlete.