Don't rush your first purchase; beginners are liable to be dumped with unsuitable or poor stock, which in the worst case may bring poultry parasites or disease onto your property. One sick bird can kill many, now and in the future. You are wisely doing your research before setting out on what should become a wonderful experience; this warning is intended to stop it turning into heartache. It really does pay to get good foundation stock of exactly what you want, and not just what a breeder wants to pass on, especially to dispose of surplus cocks.
I wouldn't get two pairs - you definitely don't want 2 cocks in a flock of 4. You may not want any cocks; their crowing is not popular with everyone and especially with their neighbours. And if they are coming from different sources, at least 2 weeks' quarantine, separately, ideally in a shed or garage with a concrete base, is strongly advisable. Good luck! I love chicken-keeping and would recommend it to anyone.