My biggest investment each month is into pension, and ACV, as the tax relief you get really makes it a no brainer. However I also invest in a global growth fund through Hargreaves Lansdowne. Currently +19.52%. All managed by a fund manager (his fund is about £650m with 45 separate holdings currently), just pay in each month and leave them to it. I was playing about with another share account, buying my own, but I'm just not interested enough so have left that alone now (other than a few holdings that I'm watching and hoping they recover so I can sell). Also stick a bit in savings accounts, move it around to ensure the interest rate is 5%+. And got a balance that I move around these ISA/accts that give a high rate as long as you don't make a withdrawal for a certain amount of time 1/2/3 years.
Start on ETFs rather than single stocks is a good initial tip, as you are spreading your investment over a wider range and will incur less volatility especially in the long run.