Happy Sunday to you Allen. I would recommend using Jaaxy keyword tool to find a domain name. If you don't already subscribe to Jaaxy, no sweat, you get 30 free searches before any subscription is required.
Select a niche that you want to start a website in, and then by brainstorming ideal search keywords (search phrases you think other people would use to find the subject material your site will be about), enter this search term into the keyword tool. This will be your "seed" keyword to start with. The keyword tool now displays many similar keyword phrases along with your original keyword phrase. To the right you see Domains. Find the best keyword phrase you like, then click on the domain column for that keyword. The tool will give you a list of domains available using this keyword in the domain.
I hope this helps you in finding the best domain for your site. You can also read this blog post for other tools to use for domain name selection: 18 Tools for Picking the Perfect Domain Name Ken

You would just see which terms yield popular searches/traffic.

Happy Saturday to you Allen. Normally a sign-up form is actually a service that you pay monthly for, like Aweber, GetResponse, etc. MailChimp (mailchimp.com) is free to use and is normally used to send email newsletters to your subscribers. It is also used to get subscribers. Another free app to install on your website is SumoMe (sumome.com), which offers several free apps to use, like a popup window when a visitor is about to leave, etc.
I hope this helps.
To Your success,
Ken

Thanks, you made my day!

Yes, you can create as many Facebook pages as you would like. They will all be connected to your original account. They have a mobile app called Pages Manager that makes it really easy to manage multiple FB pages on the go.

As far as I know you can only have one personal account and multiple business pages

I'm not using it but I know you can use a shopping cart plugin with that theme. You might need to check with Site Hosting to make sure they support the one you choose.

You might want to look into using WooCommerce.

Or you can look at WordPress Simple Paypal Shopping Cart.
Buyers do not need to have or use Paypal - they can buy using their credit card via the Paypal gateway.

~Jude

Is this a product that you own? What kind of product is it?

The only way that I know of to protect anything is to Patent it. But it is a long and complicated process and not cheap.

You would need to check the Patenting laws of the country where you live. Your local chamber of commerce or government website might have more information on alternative ways to protect your ideas, inventions and creations.

~Jude