elliottprice on "Loading more posts on front page (Custom theme)"

I have a custom theme that I created, and on the frontpage I want to load the most recent 10 posts, but then have a "Read More" or a way to load more posts. Is there an easy way in the index.php page using PHP to load more posts? I tried a plugin, but it didn't work on my theme. I'm using the standard PHP loop code to load the posts.

My thought is to have a button that will change the parameter or variable that defines how many posts are loaded on the front page, but I can't find any documentation online to do this.

Thanks in advance!