Hi,
I have not fished at the trout farm, but believe that it has a fairly uniform lake bottom. If someone can give you some info on small drop-offs it might help, fishing just over these as the fish will be patrolling these edges. You need to establish the depth of the area you'll be fishing fairly accurately.
I'm not sure what your approach wil be (between waggler and feeder), but recommend that you try and establish a feeding spot ±10-20m from the bank (if reeds are present, try and fish to these - ±1-1,5m short thereof).
White bread will work great as hook bait, either as soft paste or as flake. Feed with normal Supercast feed and add on a 2kg bag of groundbait at least 1 tin of whole kernel mealies (also keep a few as hookbaits and don't be afraid to flavour these hookbaits - use Hasbeen or Legend from Supercast). Make 10 balls of feed and throw these (by hand) with an easy rhythm at a reachable distance - try and be as accurate as possible (±1-2m² area) and remember that you might have to to-up your swim later during the session with another 3-5 bigger balls of feed.
Make sure your rod setup is sorted out and make sure that you can cast to the feeding spot with ease (you can even throw the waggler at a comfortable distance and then chuck the feed by hand to the float). To make sure that you've got the float on the same spot everytime, you mark the line with either a tipp-ex pen or black permanent marker, depending on the colour of your line. Remember to cast past you feeding spot, sink the line by putting the rod tip in the water and striking upwards - reel the float to where you've marked the line and you're on the spot. The fish may not always be right on top of the feed and you may well catch them to the left or right of the spot, depending on the undertow. Once you start catching fish, try and throw a small (golf ball) size ball feed after every fish caught. (With the feeder you just try and hit the spot everytime - no real fancy "footwork" - try and fish your groundbait as soft as possible in the feeder). When fishing with the waggler, allow for ±30-40cm of line to lay on the bottom (thus "overdepth") - with the feeder this can be 20-30cm.
Enjoy the fishing