How can I advise my sisters regarding prayer, especially since each of them has her own circumstances and ideas about religion and commitment, and how do I begin seeking religious knowledge to become a conscious Muslim woman?

All praise is due to Allah, who has guided the questioner to maintain prayer and invite her sisters to wear the hijab. It is recommended to speak with them frankly, with love and affection, about traversing the straight path. If they do not respond, then she should first approach her parents, who are themselves upright, as an example, presenting the matter with wisdom and continuing without despair. It is also recommended to provide religious tapes and booklets. As for seeking Islamic knowledge, it is important for understanding rulings and worshipping Allah with insight, and it increases one's awe of Him. One should begin by memorizing the Quran and its simplified exegesis, then a concise text on creed and jurisprudence, focusing on the rulings of daily life, and learning the Arabic language. Seeking knowledge requires patience, perseverance, and the companionship of a diligent teacher. And Allah knows best.