I'm new to this too and thankfully read the blog Justin Kobylka did on this very question and his advice was to start with good females that will fit into your breeding program (i.e. what you would like to raise) and get them first as it will take several years to get them up to breeding size. Males can breed, from what I've read here, at around 800 to 1000g and they can get up to that size in under a year so get them later and save a bit on feeding and husbandry costs. On that note you'll see from my signature that I haven't followed it to the letter but I do have more females than males.