Hi, I've not been keeping chooks for all that long myself but one tip I have picked up is give the layers pellets/mash in the am and the corn pm as it is slower to digest so a) is good to provide fuel to keep them warm at night and b)seems to knock back their laying if fed in the morning...
As long as you have only two, and the pen is tall enough for your size of birds it is probably big enough, especially if you are moving it onto fresh ground fairly often, but the more room to roam around you can give them the happier they will be. Some breeds are better than others for small coops. My birds are free range, but I can shut their pen if I need to - bad weather, new birds introduced, or in theory (not happened yet) If someone has to chook sit for us to keep them safe whilst the house is mostly empty - incase the foxes get more bold...
Anyway I'm sure you'll get loads of more experienced help soon...<g>
CA