WordPress install startup vs using a webbuilder

I’m a very light user of WordPress, aka maintain 1 site.
I lost my small company site, and re-bought the host/domain and WordPress.

I’m jfoconsultng.com
I just need 3 pages. Text and a few graphics on first page.
I need it to be mobile friendly.
Contact us (done)
Help others.
Text and a few graphics.

Go Daddy gave it to me with Ninja should I use that ?
Is it realistic for me to get this up and running.
I can’t seem to get “flutter” or any of the recommended add-ins showing on the list for Add Plug-ins
Are there templates were I can drag and drop the content for my page ?

I don’t have the pages from my old site, but I do have the images and the text.