Beginning tool path text

Hi,

What commands are normally used in the beginning of a G-code tool path?
In the first few lines I can see initializing several things: G90 or
G91, Tool number, Turn tool offset on or off, Move Z to clearance
height, Set feed rate...
]
Something like:

G90
G40
T2
F15
Z0.5

Is this a reasonable start to a G-code file? Any recommendations?

The last few lines I usually use to park the machine and end the
program.

Something like:

G90 Z1.0
G90 X15 Y10
M02

Maybe turn off tool compensation if it is used.

What do others use to start and end their Tool paths?

Clint Bach