Hello, I am Yoshi from NILS Japanese language school. We will finish Lesson 13 today.
[Nに　V／Nを　V]
The particle に marks the goal when used with verbs like はいります(go in), のります(get on), etc. The particle を makes the starting point or place when used with verbs like でます(go out), おります(get off), etc.
(Example)あの　喫茶店（きっさてん）に　入（はい）りましょう。　　Let’s get in that coffee shop.
7時に　うちを　出（で）ます。　　I leave my house at 7:00.

[どこか／何か]
どこか means anywhere or somewhere. なにか means anything or something. The particles へ and を can be omitted.
(Example)週末（しゅうまつ）は　どこか[へ]　行きましたか。　　Did you go anywhere in the weekend?
何か[を]　飲みたいです。　　I want to dring someting.

September 4th News, from NILS Japanese language school.