Alll about my guinea pig?

Usually it's better to leave them alone to adjust for a few days, to get used to their surroundings. However, if they have a box or house in the cage, they can just disappear into it whenever you come and NEVER get used to you, either. Therefore I suggest that you leave him be at first, but don't put any houses into his cage as of now. DO, however, give opportunities for shelter like overhanging hay or maybe a hammock, just not something that he can completely disappear into.