To get right coords use /loc in game in places you wish the spawns.
To get random spawns use in jython
...rest of script...
landing == Rnd.get(100)
if landing < 33:
st.getPlayer().teleToLocation(143209,43968,-3038)
elif landing < 66:
st.getPlayer().teleToLocation(143209,43968,-3038)
else:
st.getPlayer().teleToLocation(1454209,44968,-2138)
...rest of script...
Dont forget to add at the beggining of the script:
from com.l2jserver.util import Rnd
If using different version than l2j epilogue you must check how the imports works in your pack and change to look like others.