Font and Formatting

1a) Related Products is where it should be so it looks like you fixed this.
1b) Looks OK here so looks like you fixed this.
1c) They are where they usually are. You would need a bit of tricky code to put them somewhere else. PHP skills would be needed.
1d), 2), 3a), 3b) Please try this custom css:

.woocommerce form.cart button.single_add_to_cart_button {
  background-color: #f00 !important;
}
.woocommerce form.cart button.single_add_to_cart_button:hover {
  background-color: #ff0 !important;
}
.woocommerce ul#shipping_method li {
  text-indent: 0 !important;
}
.woocommerce-terms-and-conditions-checkbox-text a {
  color: #f00;
}

Replace the colour codes with your own choice.

Custom CSS can be entered at:
Dashboard > Appearance > Customize > Additional CSS