NE/HU Can be played these ways.
DUAL FL or FL/AM with mass archers/footies, expand. Then keep harassing until human expo is up, and just tier to 3 and get advanced units. Or you can keep pushing with your massed tier 1 units/or tower.
Another is DH/AM with stanard build, teching for tier 3 with bears and rifles/casters. The only flaw is your ally NE gets weak real easily when teching, and usually it leaves the enemy an chance to expo. So I usually stray from these strats when I at with my buddies.
Potm/AM is also a good choice, mass hunts/rifles, then tower push with mass tier 1 while setting up an expo after first clearing it. (If your ally is an good human, he can pretty much creep it with just a level 1 archmage and 4 milita with 2 footies regardless of map) And ne will feed a little bit to get you rifles, but other than that you should then attack with at least 5-7 rifles/7-8 hunts and tower them peferrably ne since their towers can regenerate/move, and still have nice damage to compensate for it's slow attack.
There are more tactics but those are the most well known/used/ or just peferrably the best to use against any race. Usually versus orc/ud you'd go KOTG/Pal with holylight/aura and just get some invul pots for your pal, and mass rifles/hunts then to gryphs/bears, but this can usually go either way. It will work if you play newbs, but most of times it's an guaranteeded stalemate (which means it'll result in your forces and theirs just being as strong, and you having to expo or get money through goldmine.)
GL and hope I have helped