I'm no pro.
I would do a small YP ad, mostly phone number and logo. You can do good with valpak if you have a good ad. Face to face and referrals would be the best way to go if you have little to no budget. Make a good impressiona and just sell yourself wherever you go. Future customers are around everywhere you go. You can have maintainence programs that you can sign your customers up to or call them if its been 6-12 months since last cleaning.
I think in this business you get out of it what you put into it, you just have to find what motivates YOU. Is it money, fame, ego, better life for family ect.
What I am planning:
Word of mouth
family and friends
referral (very important)
Cleaning program
keep in touch with previous clients
face to face commercial and who else that has a pulse
small postcard mailing
1-2 areas of valpak
Thinking of sending out good looking guy or girl to do door to door solicitation
green blogs
get a artical written on me if possible in the paper
NOT craigslist