If it's an older house, a heavy curtain across the front & back doors can make a big difference.
It depends how far you want to go really!
There have been quite a few threads already, so there are plenty of tips on them! A few I can remember, but I don't (yet) do myself
Save the water (while it's running to get to temperature) to mop floors/water plants etc.
Put a timer on while you shower, try to beat your time them make that the limit,see what you can get it down to.
Think more carefully about what clothes actually need washing & be more careful about how you load your machine.
Line Dry everything you can (I do do this but because I'm weird & love hanging the washing outside!!)
Only boil what you need to in the kettle (& some are filling Themos flasks)
One I've remembered from my childhood, keep the freezer full!! Use bread or polystyrene if you don't /can't have a lot of food you need to freeze.
Stop snacking or at least make your own! Popcorn kernels are dirt cheap and only take a small amount of energy.
Batch cook.
Batch cook several things while the oven is on anyway.
Use bench top grills/halogens/etc that use less energy than a full size oven.
Think about your transport options. Can you save money on the bus fare by walking to a different bus stop?
If you have to drive to work can you lift share? Or you just be the driver & get a paid passenger?
But enjoy having your first property!