You need to choose race and class.there are 3 classes, engineer, tower builder and altar of hero(hero). you can upgrade units and towers if you choose engineer or tower builder or there are many items for hero if u choose hero. to win you must destroy enemy castle.

Every race has some special units
Human - Healer - Heal,
Night Elf - Dryad - Trueshot Aura,
Orc - Shaman - Bloodlust,
Undead - Abomination - Disease Cloud.

Every 30 seconds there are spawning all creeps near castle and they attack enemy castle.

Troops:
100 gold : melee unit
300 gold : ranger unit
500 gold : unit with race ability
1000 gold : unit with range upgrade
3000 gold : flying unit
5000 gold : range unit with splash attack

There are upgrades for every unit or tower, every upgrade has 10 level.
Upgrades :
Damage : 20%
Attack Speed : 10% (5% for units with range upgrades)
HP : 20%
Armor : 20% for units, more for buildings
HP Regeneration : 100%
Range : 50 (only for 1 unit per race)
Ability : increases 1 level

When you research some upgrades for units it will be researched for all players (lets say you upgrade 5 lvl footman attack and your teammate upgrades 5 lvl footman defense, your troops get both and you can upgrade to lvl 6 both attack and defense). also units and towers can be upgraded to better units or towers for 10x cost of that unit or tower.

Every race has 6 heroes, 2 for every attribute.
hero can be trained in altar of hero if you choose that and hero cost 1 wood so you can only have 1 hero.
max hero level is 1000, hero has 5 spell, 4 normal and 1 attribute bonus, every spell has 20 lvl, every level of attribute bonus is giving hero 10 bonus to his attribute and 5 to other 2 attributes.

There are many items for heroes, shops are in 4 places but they have big range and you can buy item everywhere, there also are recipe shops, there names are level 1, level 2 and etc. aura shop is only for aura items, there are many auras(damage , lifesteal, armor and etc.). and item shop there are orb effect weapons , if you buy this weapons it has special effects and can be upgraded, there is item named weapon it costs 10000 and gives every hero some special effects and also some skills, damage or attack speed. Shop is for normal items that are required by recipes.

Bosses are neutral creeps that are on map, they are for money and xp and they are not dropping any items, if boss is killed it will not respawn, money is given only to killer. all bosses have spell immunity

Brood Mother :
hp : 20000
Damage : 500
CD : 2sec
Armor : 20
Gold awarded : 2000

Dire wolf :
Damage : 1000
CD : 1.5sec
HP : 30000
Armor : 40
Gold awarded : 5000

Ursa Warrior
Damage : 2000
CD : 1sec
HP : 50000
Armor : 60
Gold awarded : 10000

Murloc Nightcrawler
Damage : 3000
CD : 1sec
Armor : 80
HP : 75000
Gold awarded : 15000

Satyr Hellcaller
Damage : 2000
CD : 0.5sec
Armor : 100
HP : 100000
Gold awarded : 20000

Razormane Chieftain
Damage : 5000
CD : 0.5sec
Armor : 120
HP : 125000
Gold awarded : 25000

Berserk Wildkin
Damage : 10000
CD : 0.5sec
Armor : 140
HP : 150000
Gold awarded : 35000

Centaur Khan
Damage : 5000
CD : 0.1sec
Armor : 200
HP : 200000
Gold awarded : 50000

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Some terrain help : BlinkforFear
almost everything else : ME