UPDATE!!!
I got the points wrong in my list (never trust another man's spreadsheet!)
I've had to do some re-working with the units and I've taken into account some of the other advice I've been given so far - here's the new (and correct) breakdown of my first-ever army - any advice you can give would be invaluable!

1 unit of 3 bulls + ironfists
joined by a butcher with dispel scroll and bangstick
1 unit of 3 bulls + ironfists
joined by a butcher with dispel scroll and skullmantle
1 unit of 3 bulls + ironfists
1 unit of 7 ironguts + bellower + standard bearer
joined by a tyrant (army general) + fist of laurels + tenderiser
1 unit of 8 gnobblar trappers
1 unit of 2 leadbelchers + bellower
1 unit of 2 leadbelchers + bellower
1 gorger
1 unit of 2 rhinox riders + bull rhinox
total cost: 1,999 points
how's it looking?