To teach in a maintained school you need to have Qualified Teacher Status. There are a few main routes to this.
The Post Graduate Certificate in Education (PGCE) is the most common route to Qualified Teacher Status. It typically is studied one year full time, where a portion of your time is spent studying at University, whilst also gaining practical experience working in schools as part of the course.
There are specific PGCEs for Early Years and Primary school teaching, as well as subject specific PGCEs for secondary, and Post Compulsory Education PGCEs for teaching in Further Education establishments such as colleges.
Extra bursaries for teacher training are available for graduates from certain high demand subjects, which can viewed here;
You may be eligible for student finance from the government to cover tuition fees and living costs.