Made first iTunes purchase, unsure how to do this?

I have:

- 2011 27" iMac
- 3rd gen iPad 64GB WiFi
- iPhone 5 32GB ATT (with tether package for the iPad)
- 12Mbps home connection and wireless N home network

Anyways, I'm a big pirate and I couldn't find the children's show my son likes on torrents so I looked at iTunes and there it was. Purchased a season for $13.99. It's 13 episodes.

Here's the situation:

I want to download 4 episodes (out of 13) to each iDevice.
I want to download 0 episodes (out of 13) to the Mac.

I want to be able to stream all of the episodes on the Mac without downloading them and I want to (if i ever need to) stream episodes 5-13 on the iDevices.


Is this possible. Should I:


- Open iTunes on each iDevice, select which episodes I wish to download to the iDevice. Let that finish.

When I open 'Videos' on the iDevice, of course it shows I've bought the whole season but will it stream or use the local copy?


In short TLDR:

- How can I download only select episodes of a season to my iDevices.
- How can I download -nothing- to my iMac and only stream from the Internet?


THANKS!