First of all always go to manali in a volvo bus dont take normal bus otherwise you will go vomitting second thing always take extra clothes extra shoes and extra undergarments with you and if possible a rain coat as well. on reaching manali you will get lot of people trying to rent there hotels but dont go with them. it is very good if you have prebooked your hotel. if you want to live in a standard hotel it will go approx 500-600₹ per room in which atmost 3 people can live. there are 5 star hotels as well. Few things you should consider one of them is bargaining if you are good at bargaining then you will know how items are overpriced here people always try to sell there items at 3 times the price so it is better to be prepared few places you should visit is gulaba, solang valley, kasol, manikaran, kullu river rafting and paragliding, jugni waterfall, hadimba temple, vashisht temple etc
you can do paragliding in 1000₹ but people there will ask for more than 2500₹ see the overpricing here so again I must say bargain. one of the things you must do is rent bullet and go for a bike ride. you can go to solang valley or kasol with bullet it will cost you 1000₹ per bullet and petrol charger extra but the trip will be worth it. and at manikaran temple you can bath at warm pool which is ver famous you can rent taxi for there. at last I must say it will be a lifetime experience. go for it