i need some advice on small businese marketing

hi, i started a company doing computer service. my target customers
are small businese owners with staff less than 50. i have made some
flyers and tonight i went around shopping plaza and tape them. is it
legal to do this? i saw some shop had sign "no solicate".

my question is if i can not pass or post flyers. how do i go about to
market my service? i don't believe in newspaper. i had tried it once
trying to sell my car with no result and i don't believe much of the
businese can come from it.

what can you do to promote your businese service? what do you guy did?
do direct mail work? where can i find some direct mail template?

what other method did you try to market your service?

thank

jack