Ok. Ignore what your friend has said and start at the beginning:
How can you work in the UK?
You must find a sponsor. This means an employer who has advertised a job and has not been able to find anyone in the UK or EU who is qualified (not suitable, but qualified). If they cannot find anyone else, then they can consider you. If you are offered the job, they must submit paperwork proving there was no one else (this is called the resident labour market test). They must also be approved as an employer to sponsor Tier 2 General workers. They could then issue you a restricted certificate of sponsorship and you could apply for your Tier 2 General (work) visa. the Restricted bit means you applied from outside the UK.
How you do look for work as a teacher?
Many jobs are advertised on tes.co.uk and the guardian websites. There is currently a teacher shortage in some areas, but not all. The current shortage occupations list is:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/486107/Shortage_Occupation_List_-_November_2015.pdfShortage occupation means you are exempt from the RLMT, but you still have to find a job and sponsor first.
Currently only high school Physics, Chemistry and Maths teacher are on the official shortage list, but I've read a lot about many schools struggling to recruit in previously abundant subjects (I am a physics teacher).
How can I get my qualifications recognised?
You will have to apply for QTS (qualified teacher status) through the following website:
https://www.gov.uk/guidance/qualified-teacher-status-qtsIt should be really straightforward as long as you do not have any sort of 'probationary' status...
FE has had funding cuts up the wazoo over the last 5 or so years - I wouldnt touch it with a barge pole! I've heard some pretty grim horror stories. Not that I would ever recommend teaching in the UK full stop. I wouldn't if you pride your professionalism, your home life, or your sanity. Only 60% of teacher trainees get through the first year...