What's the difference between PS CC and PS Elements?

Elements as I remember (my vague experience is from earlier versions) is much more guided for all image manipulations and has a lot of automatic adjustments.

Photoshop is for the "professionals". (I do not know of any pro using Elements, but I know a lot amateurs using Photoshop CC).

I guess that especially prepress requirements are better be met in Ps CC.

I wouldn't, however, do any flyers in Ps. Personally I do flyers in Indesign, but Illustrator is also well suited, if you do not a heavy brochure. The difference between Indesign/Illustrator and Photoshop lies in the handling of vector art including type setting.

In my early days I've done some adverts in Photoshop, because the editor asked for JPEG or TIFF files, but that is no more asked for, except sometimes in exotic countries by some obscure printers...

So my advice is to go for vector graphics software (Illustrator/Indesign) for flyers and brochures. Photoshop is a great photo editor. Elements will be easier to use at first but reach sooner its limits.

PS Elements is the LITE version of PS Extended.  For the modest price, it's a good little photo editor but it's not nearly as robust as PS Extended.  

Having said that, I usually make posters in Adobe Illustrator not Photoshop.  AI is a vector graphics application.  The print quality is much sharper and clearer with vectors than rasterized or bitmap images.

See this inspirational tutorial.

Create a typographic poster in Adobe Illustrator - 99designs Blog

I see it as the professional user vs the home user (Chuck used the word hobbiest), but really more for editing personal photos than professional level editing.

Here are a few resources for you to look over. The second one lists the Photoshop features missing from Elements.

Which Do You Need? Photoshop Elements vs. Photoshop CC

https://www.capefearnetworks.com/adobe-photoshop-elements-vs-adobe-photoshop-creative-cloud-which-is-right-for-me/

https://www.capefearnetworks.com/adobe-photoshop-elements-vs-adobe-photoshop-creative-cloud-which-is-right-for-me/

Posters normally have type and I really don't know how Elements handles type, and I'd want to know before making a decision. You might ask on the Elements forum: Photoshop Elements

~Barb

Photoshop CC is much more robust, and if you're doing what you say you're going to be doing, that would be the way to go. Elements is more for hobbyist. You can do a Google search to find the actual differences.