I need some changes in website

Hi,
I have a website where I am providing all kinds of dental products and services. I want to make some changes to my website like I want to change the theme of my Homepage and I want to add a review page on my website. I have no idea about these things, So anyone here can guide me on this? The current theme is not so good, you can see it on fromhomedental.com. I will be very thankful if someone helps me with this.