Manual

Do an internet search for what you want but I would say the chances of you finding what you need is around 100%.

Yes, also you may wish to look for a 2002 Toyota Camry (as Toyota makes Lexus and the ES300 is identical mechanically to a Camry). Just a tip that might save you some dough. I owned an LS400 and an ES300 and it took a few trips to the dealer back in the 90s before someone let me know that Toyota parts could be used instead of factory Lexus parts (for example, the starter went out in the ES300 and they wanted $650 to replace it with a Lexus starter, I pulled a starter from a 1995 Camry for $35 dollars at a salvage yard and it worked good as new!) Best of luck!

You will need a Lexus owners manual as the Camry's controls and other features will be different.