For example, my Ishta Devata is Vishnu so can I chant these mantras:
- "ॐ नमोः नारायणाय. ॐ नमोः भगवते वासुदेवाय" / "oṃ namoḥ nārāyaṇāya. oṃ namoḥ bhagavate vāsudevāya"
- “ऊँ नारायणाय विद्महे।वासुदेवाय धीमहि। तन्नो विष्णु प्रचोदयात्” / “ūm̐ nārāyaṇāya vidmahe।vāsudevāya dhīmahi। tanno viṣṇu pracodayāt”
Source of this question: http://sivanandaonline.org/public_html/?cmd=displaysection§ion_id=525
Get the Mantra initiation from your Guru. Or pray to your Ishta Devata and start doing Japa of the particular Mantra, if you find it difficult to get a Guru.
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You can select any Mantra for Purascharana. Your Guru Mantra or Ishta Mantra is the best. Sandhya time...