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A simple way- You could sit in asan in front of a picture of Shiva and chant ॐ नमः शिवाय 108 times. Then sit in quietly and either pray mentally or verbally, asking for His help.
If you want to learn puja I was usually recommend Devi Mandir books-
https://play.google.com/store/apps/details?id=org.shreemaa.android.ShivaBegin
That's my biased advice