X86 install and setup

I would l like to setup on an old Dell pc. I have about 4 gigs ram and a quad core cup with 120 gig ssd. I have an older atheros wifi card and a dual port intel server nic.
I do not have experience in network ing or Linux. I was able to install Pi-hole on my raspberry pi 2. I would like to do ad blocking through the vpn and I would like to prevent any DNS leaks if possible.
Do you have a step by step guide for the pc/networking/vpn challenged.