Hi Mitch, I grew up up that way and have lived there since, in bendigo now. Have kited on Lake Boga 3 times, once on a smooth northerly was about the best i had but a south west would work well round the back. The worst part of Boga is the space you have to launch and land in so its hard to recommend it - especially to a beginner. Having said that i know of a couple of others getting started up there and one of them has been out on the lake learning - but not much. I found the breeze a touch up and down, gusty but not terrible. I have used a grunty 12m kite on there which is not my favourite lake kite but it went ok.
I have also kited on kangaroo lake, again not much room and maybe should not have tied it and also on lake charm which may have been a touch more promising but has a couple of hills around which could be a problem.
Main thing will be working around other people at that time of year.
Other option - come to Bendigo and kite Greens Lake between here and Shepparton which is about as good as i have seen for inland kiting (good breeze and sections of flatfish water) when we get a good session. there is 15 or so of us kiting up here at various times. the southerly works well or south south east and also north west. We plan sessions and post on Facebook at 'central victorian kiteboarding' if you search for us inside Facebook. There is also some video of us kiting Greens and Cairn Curran -
Generally recommend learning at the beach though! but they are they options.