First way
Do you already have customers? You can increase the current number you have twice, thrice or more by simply applying this little trick.
“Tell every of your customer the if he/she brings in his/her neighbours, friends, colleagues etc to purchase any good/service from your company that you will give them 5-10% discount on their own purchases”. This will make them persuade their friends, mates, neighbours, colleagues etc to come and buy from you. Try this out!