I Struggle With Advertising

I struggle with advertising the Sunday evening service. Where is the balance between advertising, inviting individuals, and trusting the Holy Spirit to draw people? I usually try to work hard at the first two and trust God for the third, but I'm realizing that I need to be careful that I don't spend so much time drawing up ads and thinking about commercials that I don't interact with and invite people and I don't pray for the Holy Spirit's help.
So maybe it shouldn't be a balance. What would happen if I put most of my time and effort into seeking the Lord's help and guidance and let Him bring people across my path to invite? What would happen if I allowed the Lord to do what He does and draw people that I haven't even met before? And what about advertising? I think its important because we are blessed to live in a time when so much technology is available, but should it tie up so much of our time?
I'm going to start seeking the answers to these questions by seeking the one who has all the answers...