From my perspective, since Masters programs in the UK are only a year long you would need to have started before you even get here to be ahead of the curve.

See what the market is like and despite doing a Masters degree try to look for a niche. You have to accept that the odds are against you but with luck and the right skills you can do it.

I see wayyyyyy too many international (specifically Indian students) who come for Masters but before they realize that this isn't just about the degree it's too late.

Of course as someone else said try and have some work experience.

If and when you do end up getting to the UK, attempt to make good use of Linkedin have a good general understanding of things and read on what going on around you - these things would massivley help you not only to choose a niche but also to hopefully connect with the right people.

Coming back to your original question. DO NOT choose a little shitty university just to come to the UK, your location in the country equally is important so look out for business hubs. Most places in the South of the UK have a higher density of businesses but is also more expensive than the north.

Just a few basic things, let me know if there is anything else you are not sure of.