Make a copy of one of the existin FPEs, and edit all of the fields to suit your model.....
E.G:
;header
desc = Troll
;ai
aiinit = appear1.fpi
aimain = people\Troll.fpi
aidestroy = destroy\fadecorpse.fpi
aishoot =
soundset = male
;spawn
spawnmax = 0
spawndelay = 0
spawnqty = 0
;orientation
model = Troll.X
offx = 0
offy = 0
offz = 0
rotx = 0
roty = 0
rotz = 0
scale = 80
fixnewy = 180
;cone of sight
coneheight = 53
coneangle = 50
;visualinfo
textured = Troll.dds
effect = effectbank\bumpbone\bumpbone.fx
castshadow = 0
;decals
decalmax = 2
decal0 = red
decal1 = blood
;identity details
strength = 200
ischaracter = 1
hasweapon =
isobjective = 0
cantakeweapon = 0
isflak = 1
;bodypartslimbinfo (1=head/2=body/3+4=armslr/5+6=legslr)
limbmax = 0
;animationinfo
animmax = 100
anim0 = 1,100
anim1 = 101,204
anim2 = 205,260
Just edit the texture filenames and such to suit you....