@Svetli
In addition to what
@Knecht said, some more points regarding items in particular. For melee map items there are some rules you simply have to follow (can explain reasons if necessary)
-Only 100% chance.
-Only items of the following categories: Powerup lvl 1-2, permanent lvl 1 or higher, charged/consumable lvl 2 or higher, artifact lvl 7+8.
-Rarely, items can also be specfically the following: watcher wards, runes of healing or mana (or one that restores both). Maybe goldcoins/lumber, but I havent seen those in any melee map yet.
-Buildings should not drop items, only creeps should.
-A map is generally expected to have an early-to-midgame expansion posssibilty, aka a gold mine guarded by a brown creep camp.
-If a you play as undead, you will have all those flowers etc in your base.
-Goblin shipyard seems unnecessary.