We are coming from Shingawa to Shinjuku to Mt. fuji using JRpass? what is the best way goint to 5th station of Mt Fuji thanks

My Family are going to Mt. Fuji? what is the best way going to 5th station or nice view to see Mt Fuji. We are coming from Shinagawa station to Mt Fuji and visit Gotemba premium outlet? what is the last train and time if we plan to go to Osaka or to Shinjuku? Please advice and if there is any additional fare to pay. thanks