Most important thing to do is start living an Orthodox life: moderate fasting to start, praying Compline* and morning prayers (*or evening prayers in the Russian recension of the Orthodox Church) every day, and attending Orthodox liturgy. They will start to notice, and ask questions. If they are hostile you will response charitably "I feel the Spirit is leading me to this..." or other such non-confrontational responses. If they are genuinely curious you will try to explain things in more detail. If they seem interested, invite them to liturgy. Don't rock the boat in the beginning.