Loading I-Tune Apps in IPAD

Well, got my new 32gig Wi-Fi I-Pad up and running with 4.2 all synced up. Down-loaded two free apps into I Tunes to see how this works with the I-Pad still connected.

I've read lots of the info, "I-Pad for absolute beginners" and so in...even have the 145 page manual in front of me.

With the I-Pad still connected to the PC, can't I put these two apps into the I-Pad? Does it have to be done wirelessly??

Don't have a wireless router yet. Thought I could get started loading apps into the I-Pad "with" it connected to the PC???

Guess I'm missing a big point here.. Thanks all!!! Ken