How can a wife be advised to wear the abaya and niqab, and what is the ruling on her speaking with her cousin's son via the Internet before consummating the marriage?

A piece of advice for the husband: Explain to your wife that speaking with non-mahram men without a legitimate need is a door to temptation. Inform her about the conditions of the legal hijab and help her learn the rulings of the Sharia and strengthen her connection with her Lord. Use gentleness and kindness, but do not remain silent about reprehensible acts. After marriage, oblige her to wear the hijab and prevent her from engaging in reprehensible acts by virtue of your guardianship.