Karim.29 Go and do a trial lesson at your potential flight school (these hours count) & see how you get on with school/club, your instructor & aircraft. Assuming you are happy then CONSISTENCY is key you need to be booking ideally 2 lessons per week as several will end up being cancelled due weather etc. Choosing a relatively local airfield is a good idea as you know the area, less tired travelling, weather likely to be similar to home.
You will need a Class 2 medical before you go solo but as paco says get a Class 1 if you are thinking of going commercial eventually.
In theory with 2 to 3 months available you could be well on course to your PPL by September if you booked a lesson everyday or even two. When I started 50 years ago I took 2 weeks holiday from work & flew twice a day (subject weather) to get consistency during the circuit phase. However you seem to be saying you just want to try it and get a few hours in? but then might stop? If this is the case other than a trial lesson or two you would be wasting your money as you will almost be back at square one with a significant break. So either fully commit or don't do it until you are certain.