While this is a noble and commendable endeavour, and a duty, you have to be very careful not to exceed the bounds of Sharia when it comes to friendship with the opposite gender.
You have to candidly examine your actual intention; is it to guide him or be friends with him? The former is a good thing and the latter is problematic and not recommended because of the real danger of exceeding the bounds.
I would recommend that you put him in touch with another male figure who would befriend him and guide him. In the meanwhile keep a careful check on the bounds of sharia in any interaction you have.