Bitcoin Core IS a wallet and a full-node client, you don't make it anything. You can use it as a wallet or just for running a full node.
Read here: https://bitcoin.org/en/bitcoin-core/
What is full node tho.
P.S: i'm a completely noob in this one
you know there is this super secret website on the internet that nobody knows about and it can magically answer a lot of questions.
but i will introduce it to you only. don't tell anyone
https://www.google.com/search?q=what+is+a+bitcoin+full+node
LOL dude Google is the #1 site, nice sarcasm there. XD
You should hide the text in URL format so they don't know what it is then they will click and go to Google.