I'm Back After a Long Time..A Couple Of Questions

Hi there guys, well im back after spending sometime moaning & groaning about losing my FS2004, and i couldn't be bothered to buy a new one.
I havn't played Flight Simulator for some time and my dad is out at the moment as i speak buying me FSX.
I've heard so much about FSX and i have a couple of questions.
What major changes are there between FS2004 & FSX i need to take in mind. Say, different button commands etc?
When i first install FSX and go to the Aircraft menu, what aircrafts will i find there?
Thanks a bunch and i'm happy to be back to where i love

EDIT:
would my laptop be able to handle FSX?
I cant get onto MY Computer so il just read from some sticker.
ASPIRE 5720
Intel Core 2 Duo processor T5250
(1.5GHz, 667 MHz FSB, 2MB L2 cache)
Up to 358MB Mobile Intel Graphics
Media Accelerator X3100
2GB DDR2
15.4 WXGA Acer CrystalBrite LCD (8ms/220-nit)
160GB HDD
DVD Super Multi DL
802.11q/b/g WLAN
I havn't played Flight Simulator for some time and my dad is out at the moment as i speak buying me FSX.
I've heard so much about FSX and i have a couple of questions.
What major changes are there between FS2004 & FSX i need to take in mind. Say, different button commands etc?
When i first install FSX and go to the Aircraft menu, what aircrafts will i find there?
Thanks a bunch and i'm happy to be back to where i love


EDIT:
would my laptop be able to handle FSX?
I cant get onto MY Computer so il just read from some sticker.
ASPIRE 5720
Intel Core 2 Duo processor T5250
(1.5GHz, 667 MHz FSB, 2MB L2 cache)
Up to 358MB Mobile Intel Graphics
Media Accelerator X3100
2GB DDR2
15.4 WXGA Acer CrystalBrite LCD (8ms/220-nit)
160GB HDD
DVD Super Multi DL
802.11q/b/g WLAN