Your information reads something like this:
We want to buy some house somewhere sometime and for that we want to start saving beforehand sometime.
Start saving - starting immediately. Every month via standing order transfer 1,500 euros to another account - no ifs or buts, even if there is that mega item at a super duper bargain price in that one month that you always wanted. Tax refunds, bonuses, and that other stuff too. At the same time, keep a household budget book to get an actual overview of expenses.
As you described it, you should then have at least 35,000 euros by the end of the year. Sounds like a plan - start now.