Naath Sampradaaya started with Lord Shiv (Bhole Naath) by initiating Lord Dattaatreya (Shreepad Naath) who in turn initiated many others.

Matsyendra Naath (Machchhindra Naath) got his Deekshaa when he was in the stomach of a fish (Matsya) when Shiv was instructing Dattaatreya Jee. Matsyendra Naath then initiated Gorakh Naath (Goraksh Naath) who later became the foremost exponent of the Naath Philosophy.

Gorakh Naath was the one of the greatest Taantrik the world has ever seen. Taantrik Path has 2 modes, one is Saumya and the other is Aghoree. The Saumya Path followers use very mild Mantra and Tantra to evoke the various powers of Nature while the Vaam Panthee (Aghoree) do all sorts of forbidden things like resorting to alcohol, drugs, sex, non-vegetarian food etc etc. Gorakh Naath Jee laid the foundation for the expansion of the Naath, so every Taantrik is not an Aghoree.

Gorakh Naath had the knowledge of both these Path and he initiated disciples according to their attitudes. Taamasik were given Aghoree Path while Saatwik people were initiated into Saumya Path.

Still the highest Tantra in the Naath philosophy is the Tantra of the Raaj Yog (Vivekaanand has written a book on it) and Kriyaa Yog (Laharee Mahaashaya - Yukteshwar Giri - Paramhans Yogananda order). So even after all acquiring of the powers a Naath Yogee has to finally resort to the above two Tantra (methods) to attain Salvation.

Naath Sampradaaya in fact includes all the Hindu Philosophies... some Naath Sampradaaya followers are are Bhakt like Gyaaneshwar who set up the Warakari Sect in Mahaaraashtra that worships Paanduranga; while some Naath followers worship Shiv, while others worship Krishn... So you can see that Naath Sampradaaya is actually accepting all gods.

For a Naath Yogee nothing is impossible in the universe for he experiences God through all angles as that of a Bhakt, because Guru Bhakti is the highest Bhakti in Naath, as Nature is; because Taantrik invoke the powers of Nature, as Alakh Niranjan - the foremost A-Dwait principle, as Karm - Helping the needy is a vow that a Naath takes and all.

Do not mistake Naath for Aghoree Taantrik. Tantra literally means technology or method.