Fly fishing from a canoe?

I've been a spinner fisherman for a bit of a while, and would like to get
started in flyfishing. I will be moving back to NJ in about a month, and
will mostly be fishing medium to large sized lakes. I have a free canoe,
that was given to my dad. I believe it is about 14', but I'm not 100%
sure. I have experience spin fishing from a canoe, but wonder how
practical it is to flyfish from one. Do I need to go up/down in line
weight and/or rod length/action to accomodate sitting down? I do also plan
on doing some stream fishing for trout(where I'll wade) and was planning on
a 5 or 6 wt, 8.5 to 9' medium-fast action rod. I was hoping I could use
the same rod on the lake in the canoe - where I would go after trout,
smallmouth, and the occasional other species (if lucky ). Is that
possible? Will it be harder as a beginner to learn to cast from the boat?

Lots of questions, I know.

Thanks in advance,

Pete Knox