MacBook Pro Won't install OS X El Capitan

Can anyone help me in simple easy to understand steps please?

I've got a13" (early 2015) MacBook Pro, it started acting strange recently so I tried to wipe it clean & start again.

I'm not really very pc literate, anyway, I stared the machine in recovery mode & deleted drives & info on drives.

Truth be told I'm not really sure what I did but when the machine restarts I get the option of installing OS X El Capitan, I follow the steps but when it reaches the stage where is asks me to " select the disk where I want to install OSX the next tab is greyed out & there's no other options.

The only option I have is to use the back tab to the original menu

Restore from Time machine (not an option as I deleted it)

Reinstall OSX (as described above)

Get help online (useless)

Disk utility (same story as above)

I'd really appreciate any help or advice as now's not really a good time to have to buy a new machine(:

Thanks in anticipation