I did mine back in 2014 at LPL and offered a job later. Was £20 per hour (off chocks to On chocks). No flying, no paying. Additionally, worked at other school in BPL roughly same conditions. And additionally, worked at other jobs to make a living. Delivering yellow pages (phonebooks), being a picker at a warehouse and takeaway delivery driver.
Not to scare you, but it's the reality when starting out unless you are on a retainer or some sort.
On the plus side, it's a bloody good job and satisfaction achievement. Teaching the unknowns and make them to be a better pilot than you. Share the fun and share the pain.
Typical day:
Check wx, notams, a/c, fuel, student records
Briefing
Flying
Debrief
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.
I use flight instructor manual by R D Campbell as well as school's notes.
After about 2 years time was flying twins for survey work. Now flying turboprop.
FI is definitely worth to get it but make sure you know the job market. Miss flying the pA38.