Ya can be used to join nouns which indicate a non-exhaustive list of items: "such things as, and...and."
Ya implies that the items stated are taken as examples from a larger group of items. In contrast to to, ya implies that the items stated are the only ones under consideration. Ya is commonly combined with nado ("and such"), which reinforces its aforementioned meaning.
Tēburu no ue ni, o sushi ya yaki tori ya tenpura nado ga arimasu.
On the table, there are such things as sushi, yakitori, and tempura.
Watashi no heya ni wa, konpyūtā ya sutereo ga oite arimasu.
In my room there is a computer, a stereo, and such.
Ya can also be used for the idiomatic expresstion ya ina ya (which follows the verb root): "as soon as, no sooner had."
Eki ni tsuku ya ina ya, densha ga dete shimatta.
No sooner had I arrived at the station than the train left.
Ofuro ni hairu ya ina ya, denwa ga natta.
No sonner had I gotten into the bath than the phone rang.
Hope this helps you out, next we time the particle to ka・とか, hope to see you there!
°˖ ✧◝(○ ヮ ○)◜✧˖ ° こゆうきあいはら °˖ ✧◝(○ ヮ ○)◜✧˖ °