I think its safe to say you could start researching different fish species to find out which ones you want and can keep, some are more aggressive then others and you want the least agressive to go in first. It's been nearly 3 months since you set up the tank so you can probably start adding fish soon, 1 at a time unless they are really small.
By all means get the above test kits mentioned but be aware you probably won't get any ammonia and nitrite readings and maybe even 0 nitrate readings if you haven't been putting any food in the tank
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