According to Erik A. Olsen in his article Bonsai Starter Tree the key is to choose the right tree. Once you have selected the tree or before you select this tree another step which you will need to undertake is to educate oneself about the proper care and treatment of the desired tree. In order for a beginner to carry out these tasks effectively one must educate his or her self about the art of caring for a Bonsai Tree. You can do this by buying books on the topic or getting first hand knowledge from someone who knows how to do it. Books one can buy to enhance knowledge about the art for beginners would be

1.Bonsai Gardening Secrets is written by Erik A. Olsen
2.Bonsai For Beginners

Great Bonsai Starter Trees would be

1. Japanese Red Maple
2.Semi-tropical Sea Grape
3.Chinese Elm. This particular tree can be grown in doors and outdoors and has a very outstanding shape and appearance.
4.Himalyan Cedar. This tree is noted for its adaptable characteristic they are also affordable.
5.Ficus Bonsai Tree
6.Japanese Red Willow. Very versatile tree that can be manipulated by the owner to the shape of his or her hearts desire.

The sources listed below will provide you with more information and tips on what trees beginners should deal with and also vital information no the art of Bonsai Trees.

Many people think of tiny little Japanese trees cut and pruned to a miniature size but literally speaking Bonsai means 'plant in a tray' and while they are smaller than their wild counterparts they don't have to be a couple of inches tall; they can be grown in a pot in the garden and will be smaller than their wild counterparts.

http://www.bonsai-garden.com/about-bonsai-trees.htm

the best starter trees are those that are fully hardy so can therefore be left outside all year round. elms are tough.chinese elms are what i'd recommend...these can be kept outside all year round or brought inside if you wish. - i have one on my kitchen windowsill... they do enjoy some time outside in the summer though.