Re: Tantric text to begin with.
I have noticed by looking at the fine recommendations above that the Śiva Sūtra-s were not part of the offers. I recommend them if you have the time to study this work.
My orientation is more kaśmir śaivism, so my 'bent' is in this direction. I have some personal favorites e.g. Parā-trīśikā Vivaraṇa,
Spanda-kārikās, Vijñāna Bhairava kārikās, etc.
I have been fortunate to have studied Vedanta for some years, so with that reading the association, conversation or similarities to the readings mentioned above were comfortable. I do not know of this fits in your case. I mention it as having a nice foundation to start really helps with comprehension... along with personal experiences ( sādhana, etc) all the parts then fit together.
because you are identical with Åiva