For the ways the Greeks viewed the Persians:

Much of the content of Herodotus's Histories is full of insights on how the Greeks and Persians interacted, although you have to read between the lines sometimes. In general, the Greeks viewed the Persians as a sophisticated culture, but one inferior to their own. One interesting thing to look at in the Histories is how Xerxes behaves–for example, beating the sea at the Hellespont to punish it for a bad crossing. Xerxes gets characterized as overbearing and blasphemous, basically.

Sources on Alexander the Great's campaigns will be very useful to you, as well. Arrian has a lot of this stuff in his Anabasis of Alexander. I'm painting with a broad brush here, but Alexander sacked Persepolis and then set himself up as the king of Greeks and Persians, and began working towards creating a mixed elite of Greeks/Macedonians and Persians. He trained Persian youths in Macedonian fighting styles and made all his soldiers marry Asian women. This didn't go over well and it didn't last.

The Persians were seen as formidable opponents and the antiquity of their civilization was worthy of respect (the Greeks generally thought that older things were purer and better), but they were simultaneously considered decadent and effeminate.