Email template and pdf invoice

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Hello,
I need to implement following things:

1. I'd like to change appearance for email template (change colours, etc.). Which file I have to edit?

2. I have complecated products which consists of several devices (kit products). I need somehow to insert all devices my product consists of in case if this is kit products. For example, have a look at this product:
right.travelsat.com.au/browse-products/2...ellite-tv-kit-deluxe
At the very bottom of the product description there is a "Summary of Inclusions". I need this list printed on the invoice (both email and PDF) below the name of the kit (so the buyer can check it off when they receive the delivery).
I guess I can create a text specific field for the product in order to insert this summury and then I need to insert this field in invoice and pdf invoice. Could you please help me to find out how to insert text of specific fields in invoice/pdf invoice? Or do you know more easy way to do this?

1. Thank you.

2. I've tried to do this, but without result. See attached files.

This works, but anyway there is a problem with this code. I've created 2 test products. First product has additional pecific field, for the second product I left this field empty.
When I add first product to cart (with field), and then second product (without field) - all is ok, I see specific field value for first product in email.
But when I add second product to cart and then first one - I don't see this field for both products. See attached images.

But I've already tried, you can see screenshot with this inserted code. It doesn't work when product with specific field goes after product without specific field in the cart. See all my 3 screenshots in previous post.

This works! Thank you!

Thank you very much! Actually your last variant doesn't work for pdf invoice, but your first variant works good in pdf invoice. So, I use combination of this 2 pieces of code for different cases. Also I need to add custom field at order details at user account page. Which view I need edit? Will this code work for this page (see attached screenshot)?

Also I need 1 more thing to be edited - I need to change name of order status prom "created" to "awaiting payment". So when user creates order - order must have status "awaiting payment" instead of "created". How I can do this? I need this to be modified everywhere (emails, orders page in user account, etc.)