The traditional direct path for solicitor is:
1) - 3 year bachelors degree, either law or another subject
2) - Graduate diploma in law (1 year) - only if you didn't complete a law degree.
3) - Legal practice course (1 year)
4) - Training contract - 2 years working in a law firm (you are working full time for a salary in a law firm here so from a career perspective this is when you start "working in law". Getting the training contract is the hard bit of becoming a solicitor.
5) - Qualify as a solicitor after completing the 2 year training contract.
There are alternate ways, including the new SQE exam which simplifies the GDL,LPC and training contract into a single exam with two years of qualifying work experience, but I'm not too familiar with the details of how exactly that works and whether its easier, or harder than the "usual" route above.
There's usually no need to take a LLM masters or similar. You gain an understanding of legal basis during your studies and the training contract is when you learn on the job, then you qualify as a junior solicitor assisting more senior solicitors etc.. etc...
Id definitely recommend that you carry out some thorough research around different areas of the legal field and how it all works to get a feel for what you might be interested in - criminal and corporate law are *incredibly* different and about as far apart in terms of the legal day job as its possible to be!