Thank God you have a blk lab, the other colors are much harder to train.

Seriously, if you have 10 - 15 min a day to devote to training you can get it done.
With an older dog, it's likely that most of the tasks you wish to teach is gonna take more time.
A pups brain is like a blank piece of paper, you write on it what you want. Dogs are like a page that already is written on, you are gonna have to erase some stuff to make room for new writing. It's gonna take some patience.
Suppies; (IMHO)
a solid pinch collar. (Not a choke collar)
a leash.
a long lead. I like about 25 to 30 feet of line that floats with a good brass halter snap attached to one end.
a book. There are several good books on retriever training. If we had a better idea of what your goals are, it may help with recommendations.
Best of luck.