Hi Benny
You seen to have drive which is needed to build any business, but first you need to look at all of the things that can or will happen.
Before you start you think on how many cleans you will be able to do in a month, is look at what type of window cleaner, you going to be.
Are you Trad or WFP or just Pole?
If you are Trad, you do not want to rush about cleaning, going to fast up ladders before you are used to using them again can cause you to fall and break something.
If you are WFP, it's not a magic brush on a stick that you wave across the window and it's cleaned, it takes time to learn how to clean correctly with it.
Also you will have breakdowns, which slows you down.
Next you need to decide what kind of cleaner are you going to be, some just clean the glass, while others clean everything.
Then you need to look at 1st cleans, these are difficult to predict on how long it will take you, all will take longer than a maintenance clean and you could end up for over an hour or two on one house.
Next to look at is how are you going to get paid, some go back on the night or weekend and collect the money from their customers, while others telephone/text their customers the night before so they can leave side gates open but also leave the money somewhere safe.
You now come down to customer loyalty, all of these new customers who you have canvassed will not stay with you, for whatever reason and there are many, at least 40% will leave within 4 months.
The most important part of running a business imo is Murphys Law, which simply says, if it can go pear shaped or wrong it will, I always plan for it to go wrong and have things in place the resolve them.
The other thing that is going to affect you is time, at the moment you have plenty of time but when you start to get customers, you start to lose this and the more customers you get, reduces the amount of time you have, until you run of of it, or start chasing yourself around.
Personally I would suggest that you have a 4 day working week for cleaning glass, leave the other 3 days to cover for weather, breakdowns, holidays and sickness etc.