Most retreat centers will want you to have completed an 8 day retreat before making the 30 day retreat. An 8 day or even a 5 day retreat is a good place to start if you have no experience with the Spiritual Exercises (SE)
There are two types of SE retreats offered for weekends, 5 and 8 days: the first is a preached retreat where there is a daily schedule of conferences given to the group along with opportunities for confession, individual spiritual direction, Mass, Rosary and Adoration.
The second type is a directed retreat where each person meets individually with a spiritual director once a day and is given Scripture passages to meditate on. The day is not as structured in this type of retreat. Other than Mass and meeting with your director the rest of the time is yours to spend in prayer.
I have been to both types of retreats and IMO for someone new to the spiritual exercises a preached retreat is a good place to start because the retreat leader will guide you through how to meditate and pray after each conference.
Miles Christi priests offer fantastic weekend retreats all over the US and I highly recommend them. They are great priests and their charism is to teach the spiritual exercises and to offer spiritual direction to laypeople.
Of course all of these retreats are silent.