my '99 owners manual said you may start off in 2nd on level ground and no load (for the 4. 10 rear)...
my left foot says I start off in second unless i am sitting on a hill (big un) or have a loaded trailer, and with the 01 6speed... 2nd gear also... I only use first if I am loaded, just to get the mass moving. although i recently found 1st useful for traveling excesively slowly with a trailer along I80 in a wind and snow storm... from an iced bridge to the next rest stop to clean out my shorts...