1. If you wish to have the tenants vacated then you must not accept any rent from them and immediately issue a legal notice terminating their tenancy or license and calling upon them to vacate the premises
2. if they fail to vacate the premises within the notice period stated in your legal notice then you can warn them through the legal notice itself that they will be liable to pay damages for illegal occupation of the premises after expiry of notice period till they hand over its vacant possession
3. i suggest you first speak to them to vacate the premises and if they are not agreeable then you will have to file an eviction suit in court