You will be restricted FI until you have 30 solo sign offs (I think). Basically, you can't send students their first solo such as circuits and cross country.
The restriction is that you cannot send someone first solo by day or night either in the circuit or for their first navigation exercise.
To lift the restriction you must supervise 25 solo student flights and have a minimum of 100hours experience instructing. whilst restricted you must be appropriately supervised.
Depending on where you work and what they’ve got you doing will determine what comes first. Very rare to see the solo sign-offs done before the 100hour experience requirement and if you get to do “intro” flights it could be a while before you get the solo sign offs.
At some schools, the restriction is financially neutral but others you may find a small increase either in retainer or hourly rate - so many differences it all boils down to your employer.