the word “oblate” means offering and originally referred to a youngster who was offered to the monastery by his or her parents. remember this was in a time when children were routinely given by parents to service in households of the wealthy, as apprentices in trades or guilds, or to the military, and the monastery was an alternative, especially for a boy who showed academic gifts or suitability for life of service to the Church.
today many religious orders have affliates, third orders, seculars or oblates who are lay people who join the order for prayer, spiritual direction and support of the work of the order. They adopt the spiritual charism of the order and adapt it to daily life in the world. they do not take vows, but make a profession or oblation. Benedictines have oblates, Franciscans have Seculars, etc.
the way to find out is through members of an order near you whose work and spirituality you admire and wish to imitate.