Schools are often difficult to navigate, especially when we lack knowledge, foresight and experience. My best suggestion to you is to investigate possible schools, but be reserved in your choices and affiliations: do not offer your hand too quickly to whomever you encounter, Rosicrucian, Masonic or even Gnostic. The tendency of newer students is to instantaneously affiliate with the newest order, lodge or institution without investigating its teachings, instructors and students.
Different schools have instructors and students with different levels of being: knowing what will help you will take time and patience. It would be wonderful for you to find a good Gnostic school and instructors who can help you, but that is not always necessary at all stages of the path. Personally, I was without physical contact for many years while I studied Gnosis on my own. But by utilizing the tools presented in the literature of the Master Samael Aun Weor, I was able to gain considerable progress in my work and to gain (and maintain) direct contact with conscious beings in the internal planes--all without an instructor or a school within my vicinity.
Therefore, you do not need a school to make progress, although schools can help. What matters is your work. If you're serious, your level of being will attract and place you in contact with others with the same level of being, as well as instructors who may guide you. This may occur within the physical and even the spiritual dimensions (the latter circumstance having occurred in my case before the physical).
See attached to this post Samael Aun Weor's lecture on spiritual schools. Meditate and reflect on its contents before making any decision to join a group, Gnostic or otherwise. You need to be cautious about affiliations, since if you make a pact too quickly with a group, you might ensure dire consequences in the near or far future that are beyond your present understanding, (since unfortunately, group dynamics involve ego). I've had this happen many times (and mostly even with schools that call themselves "Gnostic").
Therefore, test the school, the instructors and their teachings in measure with your own insight and the law presented in the scriptures. I have found Samael Aun Weor's writings to be essential in this, since the literature and teachings are more important than the instructor or school. Meditate on your Innermost, since He will instruct you about what you need and with whom you must associate. The internal dimensions and the wisdom of our Inner Being are the best school we can consciously attend.
Joyful in hope, suffering in tribulation, be thou constant in thy prayer.
Benedictis, qui venit in nomine Domini. Osanna in excelsis.
"Blessed is he who comes in the name of the Lord. Hosanna in the highest!"