When is the best time to buy?
It’s hard to time the market. Any time is best time to buy if you do your due diligence.
Should I fix the rate or not?
Usually fix rates are recommended when you plan stay in the place for the term of the fixed rate period. If you are thinking of fixing long term like 5 years plus, you need to be clear of your choices.
Will the house prices fall or rise?
House price will depend on lot of factors like economy, unemployment, foreign economies etc. So there is no direct answer to this question. Always do your research in the area you are buying. Historically property prices have appreciated.