I wanna add prosthetics on my face like fake gashes and wounds, etc, but my english is not the best so i dont know what to search for. if someone could give me some terms i can put into google i'd appreciate it
You are on the right track! Searching for any combination of terms like "wound prosthetics" or "fx makeup" and the word "buy" will give you a place to start. If you are looking for a specific character, add their name in too. Sometimes you may come across someone's tutorial on how to handle facial scars etc. for said character and often the person tells where they bought their makeup/prosthetics or you can ask.
Alternatively if you want to make your own, just use the words "how to make".