Your primary reason for having a small business website is most probably for people to reach you. Your website should have this capability built-in and functioning. Each time a visitor completes your contact form them email must be fired off to you with no hassle. From your side, building the contact form should be just as easy. The following are some of the tried and tested WordPress contact form plugins. These are generally supported by most web hosting providers.
WordPress is fairly SEO-ready as it is. You do however need to keep in touch and apply some SEO work to your website in order to show up on the Google rankings. This is an ongoing task and having the right tools to do it will make SEO life very easy. Have a look at these plugins.
Needless to say, security must be your top priority. There has never been such an onslaught of attacks on WordPress websites. Stay ahead of the bad guys and make sure you look at these plugins so you can fight off your attackers with ease.