Advice on buying a new/used car?

Hiii...
I live in the UK and thinking of buying a new or used car. I don't know much about cars, so apart from reading car reviews on websites such as What Car, Top Gear, Parkers, The AA, Auto Trader and Auto Express, can you suggest other things that I can do in order to decide the 'perfect' car for me?

By the way, what is the best month(s) of the year in which to buy a new/used car?

Thanks!

I didn't find the right solution from the Internet.

References:-http://www.motorcarforum.com/threads/3358-Advice-on-buying-a-new-used-car

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