Problem with user registration on the web site in Opencart 3.0.3.2

Good afternoon.

Online store on Opencart 3.0.3.2.
Need to fix these problems.
When the user registers and the placement of an order does not come two messages to the email of the administrator that registered a new user and new order.
Also, if the user registration does not appear on the website a message that you have registered and can now pay for your order and do not see that he is now in your account.
You should also change the font size and the color of some messages.
In detail the essence of the above problems and what and where to change the font and the message-send the screenshots to a separate file for all correspondence.
Payment is negotiable.