Gohan,
I am currently choosing a new driver and maybe a new putter eventually. For the driver go and try quite a few and see which one gives the most confidence and u hit the best. i asked the GTO forum to recommend a few for me to try and I added those to my list of potential new drivers.
It sounds to me like a big headed driver with very good forgiveness is the one to look for, at least for now until in a few years when ur naturally bigger, stronger with a better golf swing. I've heard some really good things about the
Callaway FT-i and Nike Sumo squared, but go and demo a few at ur local driving range.
For putters, its all about personal preference! Whether the putter is 2nd hand, 30 years old or brand new doesn't matter. Go and demo everything, you'll find something that just feels right!