art collection – for what? Investment? Or enjoyment.
The former – good luck. You can try and find artists or schools that you think are underappreciated and buy at auction, risk it online, or from dealers, or you can go to galleries and have them try and sell you what’s currently fashionable. The rise of online support of auctions has meant that dealers + retail prices are converging (and there is a rise in the hobbyist dealer).
There are lots of people with a lot of knowledge who try and second guess the market (or influence it). There are also a LOT of people faking work all the way down the scale (not just paintings worth tens of thousands – I know of at least one onlne ‘dealer’ who is buying works and re-attributing by removing/adding signatures to make money (we’re talking buying works for £10 at auction and selling for hundreds so it’s not exactly mastermind stuff). Provenance is king, especially if you’re buying online.
You can strike it lucky – I know people who bought Robert Lenkiewicz works for hundreds fifteen years ago and now they’re worth many thousands. Conversely – in the nineties works by Graham Glarke for example were at a premium and now you can pick them up for tens of pounds.
You’re better off just buying what you like. As said above – affordable art fair etc are good places to start.
If you are looking for something very affordable you can’t go wrong with Sulis Fine Art. There’s a lot of dross but more than a few gems : http://www.sulisfineart.com/