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Since you seem to know about evs already, I'll go into that first. Do you have any BP saved up? If you do, there exist training items, called Power ____. For example, Power Bracer, Power Anklet. Anyway, these items increase the ev yield from a wild pokemon by 4 points. Meaning, a machop or sandshrew will give you 5 attack evs instead of just 1. There also exists the Pokerus virus which can be passed on through pokemon, which doubles the ev gain again; finally, horde battles let you fight 5 of the same pokemon at once. Using all three of these, you can gain 50 evs in a stat per battle, and fully ev train a pokemon anywhere between 5 and 10 minutes, depending on how complicated your spread is. I'm willing to bet almost every comp player on this board has at least one pokerus infected shitmon, just ask one of them to trade. As for actually making a good team, just read up a bit, observe battles, see what works. If you're playing singles, you ought to check out smogon and see the state of the metagame, and which pokemon work well in teams together. If playing doubles or VGC...actually you might not want to do this one immediately. Singles isn't any less difficult, but it is slightly better for beginning trainers in my opinion. Basically have fun, don't be a scrub, don't be a sore loser, and don't get frustrated when you lose at first.
IVs are a whole different story. Hopefully you know about them, because I don't really feel like explaining about them right now.