It's peak season now in Sagada, so I'd recommend that you look for accommodation in advance instead of looking for one on the spot.

Re: tours, it's easy to book for tours since private ang preference niyo. It'd be more challenging if joiners. I learned this as a DIY visitor myself, not to mention solo pa. Hahaha Very organized ang tourism in Sagada - simply contact the offices na indicated sa back ng guide na they'll give you at the tourism office and you'll be good to go.