Downloding a theme exactly at it is…

I ask for an apology for my English skills is my second language.
I think is a silly question but is killing me.
I just started with WordPress and I find this free theme on the web: https://daisythemes.com/wellness/ and I installed on my website https://missfitshs.com/ and it looks terrible! I thought when you download a theme you will get exactly a copy of it with the pages, post, image and everything so you can edit and get it done really fast.

Is there any way that I could get all the data (pages, images, post) of a free theme so i don’t have to start it from zero?

Basically what I what to do is to clone it and then edit the title, images and everything… if there is any way to do this could someone please explain me? I am a complete newb in WordPress as you can see.

Thanks in advance