Using a old tank or a friends tank: If you have a friend with a established tank you can take a piece of
their filter and put it in your filter and let in run for about 6 hours and your ready to go. Or you can use a piece from a old aquarium if you have one set up and running. Also if your upgrading the size dump all the old water in your new aquarium. Remember to get the filter from a disease free aquarium with healthy fish. Also this doesn't mean you can fill the whole tank with fish you always want to start off with 3-4 fishs at a time. With cichlids add 1-3 depending on the aquarium size.
Using chemical to establish tank quicker you can use
With these chemicals you can instantly establish your tank and add fish that day. Check out each one above to see which one fits your aquarium the best. I use the Nutrafin cycle for my aquariums that I set up for people it works the quickest. Remember what I said about only adding a couple fish after you put the chemicals in. Your never want to fully stock your tank right away.
Looking to add new fish to your aquarium check out my article adding fish to your aquarium