Solang valley is beautiful.. Be safe and careful about the routes there. There is immense network issues there! Enjoy your trek . You can stay in homestays or do camps. Cheers! Please hit upvote if you liked my suggestion. Thanks in advance :)
As you will reach Kasol try to got to Manikkaran, Malana is also a place to visit. If you are going to stay at Kherganga try Krishna bhai's accommodation for Amazing food.