Hire a system admin?

I want DIY with my hand

> 1. After i buy the cost then what will i get,

An unmanaged VPS running a linux OS.

> 2. and how to set up my own blank vps?

We have plenty of articles in our community:

https://www.digitalocean.com/community/articles

> 3. i want to install ubuntu but how in my blank vps?

You can select Ubuntu as your droplet's OS while creating it.

> 4. I want use Apache, MySQL, PHP, PHPMyadmin, Zpanel, SSL key (how to set up all of this) ? which one the first i do?

I personally don't recommend using zPanel but we do have an article on how to install it:

https://www.digitalocean.com/community/articles/how-to-install-and-configure-zpanel-on-an-ubuntu-12-04-vps

what your recommend to using panel Zpanel or others please?

I personally recommend not using any panel at all and doing everything manually however that would be hard for some people so just go with a control panel with better history such as Virtualmin.

"I want DIY with my hand"

Have you ever heard of Google?

Have a look at the thread i started.

https://www.digitalocean.com/community/questions/which-panel