get hold of renas pub editor at rena.scottdollins.com or sordie.co.uk/downloads/rena/ i think ;o not 100% sure but open dat001.enf with pub edit, add new data to the pub by going data -> add row and enter all the things you need there.
then get renas map editor from the same location as you got the pub edit, open the map you want to add npcs to. go to the npc spawn editor section of the map editor. click "Add" and then enter the npc id along with the range (should be like 0 or something, play around with it) and count (the
amount of npcs to spawn) and the x and y location on that map -> self explanatory.. Have fun.
---
If money doesn't grow on trees, then why do banks have branches?