[MP2]

Use /save. The coordinates are saved to savedpositions.txt in My Documents\GTA San Andreas User Files\SAMP.

You need to save 4 coordinates. The two pickups, and the two teleport locations. You also need to type /interior prior to /save'ing the inside teleport position and note it in /save (anything you put after '/save ' will be commented in savedpositions.txt.

So, stand at the OUTSIDE door and type
/save outside_pickup

then stand where players should appear when EXITING the interior and type
/save outside_tele

Then do the same for inside, but type /interior first then say it's 5 type
/save int_pickup (interior 5)

In the file you will find AddPlayerClass(skin,x,y,z,angle, other stuff);

You only need x, y, z and angle, and the interior.

Let me know if you need more help.

I might actually make a script to place pickups.