NEED HELP APPLYING FOR VISITOR VISA!!!??

#1
Hi all! I am in need of some serious help!
So I am totally clueless and don't know where to start, I am trying to apply for visitor visa for my friend from Tunisia, i live in wales uk and i am going to visit him in tunisia 3rd july for a week i was hoping i could start the process now i have looked on every forum and still clueless! Please can someone tell me where I start :(
Thanks in advance
 
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