1. You shall have to pronounce talaq thrice iin presence of two witnesses. A egistered Qazi shall have to issue the said talaqnama which shall have to be posted by you to your wife by registered post,
2.Talaqnama does not require any stamp paper,
3. You shall have to send te Talaqnama with Mehr,
4. File eviction suit,
5.She can challenge the said talaqnama in the Court of law and also file retaliatory cases like DV case, maintenance case, complaint u/s498A of IPC etc.,
6. Engage a local lawyer having expertise in this field.