Help Professionalise online Hobby Business UK

I need some help to improve my hobby business to professional standards including:

Advice on website
Help with order fulfilment workflow (how to easily invoice and print parcel labels)
Advice on accounting strategy (how to track easily and manage books)
How to improve my EU trading (EORI number etc)

I am currently using Wordpress website with siteground hosting. I use Woocommerce with Paypal payment.

You can see the website here:

https://supaflyfpv.com/

Prefer UK based consultants or those who are familiar with UK issues/systems.