I forgot what the required space is...We started off with a pen way too small and now we have a pen that is plenty enough for 5 peafowl so we still aren't experts on space lol.
Here let me answer the few I do know...
2. The best peafowl for a beginner is going to be the India Blue. Not only are they the least expensive, but they are also the easiest to come by.
5. Mainly good tough plants can withstand peafowl. They will tear up small soft plants. If you plant any trees in with them make sure the trees are tall enough so they can't reach all the leaves and mess up the tree.
We built the pen around a wild pear tree that we sawed the top off of. Now the tree has branches growing through the netting and lots of leaves. The peafowl trim the low branches eating off the leaves making the tree look nice. They also like to eat the yellow leaves that fall off in the Fall.
Some good plants would be things like clumping bamboo (it HAS to be clumping because if you get running bamboo it will spread), cast iron plants, fatsia (I love this plant), and of course evergreens are great too. I would visit local plant places to find plants that can grow in your area that look tough. So far a lot of the decorative grass I have planted in the pen hasn't been attacked by the peafowl. I planted grasses like zebra grass and then purple fountain grass, although now that it is warming up the purple fountain grass looks pretty dead when all the other grasses are growing new blades. I hope it isn't dead it was a cute little plant. I think maybe Camellias might be okay in a peafowl pen too as long as you don't plant really small ones. That is my dream plant to put in there this summer. I want a lot of blooming plants. Roses should work too. I have some vine roses in with the peafowl but they haven't bloomed yet...Maybe I cut them at the wrong time or something. Then there are some other plants I forgot the names of.
You can use this website to help you search for plants that can work in your area, you just have to find out what zone you are in and then you can find out in the plant info if it can be grown in your zone or not and find out about care for the plant,ect. I am in zone 8a.
http://davesgarden.com/