If you are still needing a webpage I can get you in touch with the same person that did mine. It was a very decent price compared to everyone else that I was looking at. They even let me make monthly payments on it. I am having them change up a few things up on it but have not got back to them yet been busy, but that is a good thing. You can check out my site if you want
http://www.lancasterheatingandair.com
As far as marketing goes you can just do as some said in the post already with getting citations done in as many places as you can possible. Some are free and some you have to pay for. Yext is a good company and have some of the strongest citations but they are also the most expensive. Get on all the social media accounts you can too.
For your webpage, the more content, the better. That is what I am going to have them add to mine.
But to answer your question the answer is YES. A webpage is necessary this day and age. Plus if you can end up ranking in the top of google for your area, you will probably be more than busy and not need to do much other marketing.