If you have horizontilly wired frames, and the foundation is crimp wired, you don't need the pins I personally prefer the wired frames and crimp wired foundation, unless I had it in mind to make cut comb honey.
As far as culling brood comb, there are several different opinions about that. I feel drawn comb is our most valuable asset, and I am hesitant to discard it under most circumstances. Others think that it helps with disease control by rotating it out. I've seen alot of 20 year old comb still in service, in perfectly healthy colonys. As far as the diameter of the cells becoming smaller over time, this is a good thing. Many beekeepers, the Lusbys for example, are claiming small cell to be the first line of defense against the mites. I believe them, and am setting up to regress my colonies this spring. I imagine if the cell diameter actually became a problem for the bees, they would chew it out to the size they wanted it. They are pretty good about doing what they need to most of the time, as you will discover.
Finally, enjoy your bees. They are fascinating creatures that can take over YOUR life if you let them.