If the purpose dealership just to sell at a profit, without claims to be the arbiter of the fate of artists - then:
Walk through the galleries and salons of your city and find out what artists sechas in favor, who sells well.
know the percentage mark-up galleries and salons.
been connected with artists and offer their services at a lower percentage.
sostavte list of potential buyers.
Then it all depends on your talent to convince the advisability of purchasing this particular picture of the author and of course personal charm
For details please coaching in addition to special education a good knowledge of current status on the art market, the original capital or good and necessary in this area dating. From zero almost impossible to achieve something.