How to reach - Reaching Bhutan is a bit tricky as you will have to make quite a lot of transit switches. While you can always make flight bookings to Paro International airport, Bagdora is a more preferable option. A flight to Bagdora airport in India is considered to be the best way to reach Bhutan as it is closest to the border. You will have to take a bus from Bagdora, which will be 5-6 hours long.
How much it will cost you - Bhutan has some lovely Bnb and homestay options for travellers. Sure, there are some hostels as well but homestays are highly recommended as the locals are lovely and hospitable. It will cost you around 35K-40K. You can always upscale this trip by opting for fancier stay options or even renting a vehicle and voyaging around yourself.
Best time to visit Bhutan - March to May is considered to be the best option when visiting Bhutan. It is fairly chill and beautiful.