Hey Ammy, The best treks for a first time trekker are :- Triund in Himachal Pradesh Beas kund Trek Kuari pass Trek in Uttarakhand Kedatkantha Trek in uttarakhand Chopta chandrashila Trek in Uttarakhand Kheerganga Trek in himachal Pradesh Nag tibba Trek in Himachal Pradesh I would surely suggest you to take kuari as it's from easy to moderate trek and will give a confidence to you in Himalayas ... And the mountains will also give a confirmatory test to you and decide that if you are really meant for Trekking ..... Here is the link for my trek :- https://www.google.com/amp/s/www.tripoto.com/trip/winter-kuari-pass-trek-an-amazing-experience-of-my-life-59763843253d0.amp Happy Trekking Bro!!!
If you want to go for one day trek then you can go to 1)Triund trek 2)Kheerganga trek 3)Prashar lake trek For the budget tips and detailed itinerary of above you can see my posts on tripoto.
Triund would be really good option You can stay at mcleaodganj explore for a day second day treck for tirund and third day return or explore dharmshala. There are plenty of option for stay at Mcleaodganj with minimum cost.