Save as much as you can!
@Sophie agree with this. The house you buy cannot be over £450k though so depends what you want to buy
Definitely go and see a mortgage advisor. If you put your location on here you may get some recommendations. They will ask for your salary before tax too so don’t worry about your household income after tax
If you can afford to, I'd start LISAs (lifetime ISAs) each. You can put in £4k each year to each LISA and get £1k from the government into each account. This will help build up your deposit. There is stipulations on the max price of the house you want to put the deposit towards, and if you withdraw it before 12 months, you lose the extra from the government.