Responsive Theme-font sizes and menu troubleshooting

Hi
I am new to wordpress and I am in the process of creating a website to promote my holiday lodge.
Please take a look
I want to alter the text size on the home page as it is way to big.
I also want to get rid of the page title that appears in the body text on each page.
Please can anybody advise. Do I have to start altering code:-(
I am also looking to install a gallery and an availability calendar are these widgets that I will need to install?
Thanks in advance:-)