There are various websites that provide share information and investment news, Citywire and Bloomberg to name a couple. Online stock brokers such as Hargreaves Lansdown also have this sort of information and you can deal through their online system.
Stock broking accounts generally cost a couple of hundred pounds a year to run and deals cost around 1% of the amount invested capped at £50.
If you are just starting out you might consider funds such as unit trusts instead. You can achieve better diversification from as little as £50 per month and by investing in unit trusts the fund manager makes the buy and sell decisions for you.
Disclaimer:
The answers above are for guidance only and should not be acted upon without you receiving independent financial advice relevant to your circumstances. To find and IFA please go to
http://www.unbiased.co.uk