I was tired of slaving for a huge corp that really didn’t care about their employee’s. I also wanted to spend more time with more important things, especially my wife and ministry work.
I tried many things to get started, this forum was not around so I spoke to two friends one in CO and one in a nearby city who both still have very successful window cleaning companies and they gave me some advice. They helped me with tools to order and with bidding, one of which sat with me for an hour on the phone and through a wc catalog together.
Then I cold called and left cards at businesses, one larger job I got that first year we still do today as a yearly int/ext corp office and now monthly maintenance on a few of their other buildings. I do not do cold calling today because word of mouth and maintaining phone book adds help enough right now.
I tried door hangers at first, didn’t work for me. But these days you can get them made a lot nicer for a cheaper cost. I would try that again though with whats available today.
Right now I am looking for more help and thinking of adding a scratch removal system to expand.
Here are some things I found that may be a little helpful:
#1 Do not advertise in every marketing campaign you get a call from (literally just had call from another “High school” calendar ad offered a few sec. ago!) The majority are really just burning $, yes you want your name out there but are YOUR target audience looking at these cheesy things?! Focus on what WILL work not what might.
#2 Do not ever low ball bids to get work, you and the customer will not be happy with the result in the end.
#3 Soak up everything with a grain of salt you can from here on the forum and don’t be afraid to try something new, whether it be a technique or new squeegee. Especially after you have been in window cleaning for years.
#4 Professionalism is what I wanted to set myself apart from the competition 10 years ago at 25, I still try and do that today.
#5 Enjoy the chance to work in well kept yards and homes we probably will not be able to afford in our life time with out the upkeep! 
#6 Get a WFP as soon as you possibly can! Will save you in more ways than I can count…
#7 Treat people well and they will treat you well
#8 Do not expect to get every bid
#9 Do not lower a bid when getting it together because YOU think it may be to big, (“No ones going to pay that much…”) you will be happily surprised.
#10 Like I told a buddy of mine yesterday, window cleaning is like a snow ball, you have to start at the beginning not the middle to get it going. But once you do, look out!
I know I am probably saying things that you already know, but once I stated typing I couldn’t stop… it’s a rain day for me 