Agree with much of the above but particularly support what G.o.D. mentioned above, you should roast some small batches of each bean variety you have in order to gain an appreciation of the pros and cons of each of them in the cup, and make notes of your impressions. It is by doing this that you will ultimately learn how to get the best from each bean (roast profile) and which varieties will both complement and enhance the properties of others in blends.
Start out simple and as you gain knowledge and experience, you can spread your wings a bit more and develop an understanding of which beans will make sensational blends even before you roast them. Besides, its a lot of fun building up your own roast records and blend recipes, since you are catering specifically for your palate, not what someone else thinks makes a good blend. Happy roasting....

Mal.

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