Use the lamps with low consumption, they enable you to save 80% of your consumption.
Do not forget to extinguish the bulbs lit unnecessarily.
You point out especially that daylight does not cost you anything, then profit to the maximum.
Make a good choice and will be able to adapt your lighting to your needs, you there will gain in comfort and will realize savings.
The electric heating is expensive; if you cannot pass some to you, try to limit its use.
Regularly control the evolution of your consumption, maybe starting from your meters, maybe starting from the information registered on your invoices