Child theme query

Hi there, I am currently building a new website using your Adventurous theme. However, I think it's best to bite the bullet and build a child theme, as I would like to ensure the text does not keep hyphenating and wraps around nicely, amongst other things. I'm not that experienced when it comes to WordPress, so please bear with me if this seems like a basic question... I have modified the Adventurous theme using only the basic 'back-office' appearance tools in the Dashboard - I haven't actually gone in and manually edited/modified the style.css. So, my question is: would it be safe for me to create a child theme? Will this have any effect on my page as it currently looks? If it will have an effect, do you think it would be best to just start from scratch? Thanks in advance, James