Hi There,
You can set some of these parameters on Appereance Customizer Typography.
Others you need to use CSS for example
h1, .h1 {
font-size: 30
}
h2, .h2 {
font-size: 30
}
h3, .h3 {
font-size: 30
}
h4, .h4 {
font-size: 30
}
h5, .h5 {
font-size: 30
}
h6, .h6 {
font-size: 30
}
body p {
font-size: 20px;
}
blockquote {
font-size: 15px;
}
Add the CSS to Appereance Customizer Custom CSS
Let us know if you need further assistance.
Cheers