@Darlene119
Please note "long term stays" (28 nights or longer) differ from short term stays in several ways. There is a specific cancellation policy, it is mandatory to set a monthly discount (otherwise you will not appear in search results for long term stays) and you must be aware of certain laws (so guests do not turn themself into tenants). Also read the payout rules for long term stays.
Search in HELP with "long term stay" to find all articles.
As a new host maybe start with some short term stays first to experience hosting. It also generates more reviews and ratings.
You can set the min. stay to any amount of days you want. But be aware if you set it too high, only people searching for such long periods will find your listing.
Best regards,
Emiel
Happy hosting,
Emiel