SJK,
I would like to start by disagreeing with your initial premise, I was lucky enough to get an instructor rating under the old system i.e. on my PPL, and having done more than 1000 hours instructing you will find that it is ok but you will want to move on to the next challenge, i.e more and bigger types on your licence plus commercial flying, instructing is a great way to increase your experience and pass on your skills but in itself it is quite limiting.
expect difficulty getting started. e.g i did 30 hours in the first 6 months (all trial lessons)and 200 hours i the next six months, i was running about 500 hours a year when i finished which equates to £20k pa.
it is harder to find work when you are a new instructor FI(H) (resticted), because you need cover from a senior instructor, so he/she really needs to have a program before you do.
much easier to find work when your instructor rating is upgraded because you can work unsupervised (t'aint natural - work is available around london for a FI(H) (unrestricted,
however gettting the restriction removed is tougher than it used to be - in particular you have to supervise 25 solos, as well as do 100 hours instruction, 25 solos takes ages believe me, way over 100 hours normally, i reckon i must have done about 300-400 before i had done 25, you really need active help from the senior instructor to help you get the upgrade.
dont give up it may take time but you will succeed, you must be flexible (i.e travel at shirt notice long distances to do 1 or 2 trial lessons), if you say no to work they will ask someone else first next time
i have done various types of helicopter flying now and the thing that keeps it interesting is doing varied stuff, so dont set your sites too low.
hope this helps