From Haneda to Hiroshima by Japan Rail pass

I arrive Haneda airport on March 4,2013 at 10.30pm
I intend to buy a 7-days Japan Rail Pass.
What is the best option to travel to Hiroshima on March 5? and where is the cheaper hotel to stay on march 4 night?
I leave Narita Airport at 6.20pm on March 10th,
what time and which train I can take from Hiroshima to Narita airport?

What is the best option to travel to Hiroshima on March 5?

I would stay the night at a hotel around Shinagawa Station and then catch the shinkansen to Hiroshima the following morning. A transfer of trains is required at Shin-Osaka Station. The pass can be exchanged at Shingawa Station from 9am.

If you want to depart earlier, then you could take a bus to Shin-Yokohama, where the Japan Rail Pass office opens at 5:30am and a direct Hikari train departs for Hiroshima at 6am according to the current timetable.

I leave Narita Airport at 6.20pm on March 10th, what time and which train I can take from Hiroshima to Narita airport?

I recommend the following connection:
http://www.hyperdia.com/cgi/en/search.html?dep_node=HIROSHIMA&arv_node...

You could also stay around Tokyo Station where the rail pass exchange office opens at 7:30. However, there are no cheap hotels near Tokyo Station.

hiii sing12,
If your intention is to travel to hiroshima and back to haneda and not stopping any
other destination, i suggest you check out the airline discount ticket in Japan guide.

Theres a special discount ticket for foreign travellers just similar to rail pass. It can be a little cheaper and save travelling time.

If your intention to stop at other destinations on the way to hiroshima...then rail pass is better choice.
good luck