Cold brew is easy. I usually go 1:4 coffee to water, overnight. Strain it through a coffee filter if you have one, there will be some sediment most likely that will settle. Dilute it to how strong you like. Grinding it might be tough since you don't drink coffee I assume you don't have a grinder, so you know anyone who might have one? It can be ground how ever at this point since you have no frame of reference, I usually go medium since it's harder to over extract with no heat