You need worker foundation otherwise they'll just draw out drones which you really don't need. I've got nationals and just buy standard wired (although I have just bought some unwired for honey comb experiments in my super). I don't know what you mean by where is the best place to use it? Also you probably won't need your supers this season so don't bother putting foundation in them yet - it's best kept flat in its packet until close to the time you're going to use it.
Where and when are you getting your bees from? Have you been on a beekeeping course? If not, I would really, really recommend it. Normally I'm only to happy to read a book, research on line and then give something a go but bees has been my major exception. I'm only in my second year and I find it really complex - it's a bit like chess in my mind, you always have to be one step ahead, working out how to manipulate everything in the way you want it to be. If you want healthy bees to give a consistent supply of honey (plus pollination and all the other benefits), you need to know what you're doing when you're inspecting the hive, understand disease identification and management, know how to manage swarm attempts etc. etc. Your local bee keeping group probably runs courses so get on to them as soon as possible. Hopefully you can also find yourself an experienced local mentor who you can call on in times of crisis. I've found a lovely man who lives just over the hill and is normally available at a couple of hours notice to help with whatever issue I've come up with.