There are several points to consider.
1. You can register your domain name get4x.com with any registrar. In this case you have registered it with name.com. That is OK. Your registrar is like the Telephone Yellow Pages. They hold your domain name and point to where it is hosted. Just like a telephone directory listing your Company Name and pointing to your address and telephone number.
2. The next step is to decide who will host your site. (or where your Company Name is located, the physical shop address and telephone number) There are many web hosting services available. If you do a Google search for “web hosting services” or “web hosting plans” or “website hosting” many companies will be listed. Some have good reviews and some have many complaints. The more popular ones are godaddy, hostgator, bluehost, … I have never used them so I do not know how good their service is.
Normally, your web hosting provider will set up both items 1. and 2. above for you. Your out sourced vendor should be advising you of this.
3. I have never used WordPress hosting services so I do not know anything about them.
4. Once you have registered with a hosting service provider get4x.com you will be able to view the site at https://www.get4x.com.
5. You can have a another site at https://blog.get4x.com and this will be considered as a subdomain. There are no additional fees to register a subdomain. A subdomain is a sub-directory at your site. The directory structure will look like this https://www.get4x.com/blog/ and under this sub-directory you will install WordPress. Before you install your WordPress in this sub-directory you will have to inform your host that it is a subdomain. You can contact your host tech support to set it up for you or use the web hosting control panel to set it up yourself but in this case your vendor should do that for you. Then install WordPress under https://blog.get4x.com.
once you have done this you will have two sites get4x.com and blog.get4x.com and you can use them for what ever you like, not just for WordPress.
Don’t worry about multi-site and networks as they would confuse you even more. You are just beginning so you will find you don’t need such features.