For me a lot of reading and then a lot of trial and error small batches can be helpful. I found early setting out for a. Certain style of roast and end purpose helped a lot. I first mastered a good filter blend then worked up to a dark for espresso and once I had a good feel for both it was easier for me to get single origins and a multiple of others right. Tons of stuff online and remember nothing helps more than reading and planning.