this site really needs some intermediate guides

walking couriers are very, very easy to kill. Flying couriers are a fair bit harder, but ranged heroes with blinks can chase them down if you're not watching.

another question that i forgot to ask is how jungling works in this game. besides roshan are there other neutral creep buffs? how does the route work? can any champ jungle, ive played some dota games where the neutral mobs were just extra farm and slightly tougher to take on.

1.Neutral creeps don't give any extra buffs.
2.Neutral creeps are diffrent from each other in toughness,gold and exp gain.
Yellow=Easy
Purple=Medium
Brown=Tough
White=Very Tough

Aslo in same spawn always won't spawn same neutrals, neutrals are diffrent from each other and it's for youself to test wichones are more stronger, and tougher to kill for particular hero.
3.There's only some heroes who can jungle from level 1.
Here is the list:

1.Chen - he can easy jungle because his 3rd skill can posses almost any neutral creep. That way you command him to attack other neutral. At last level of that skill you can control 3 neutral. Usually at lvl 1 you find most toughnest creep you can find and control him.Additional that creeps gain bonus health and movmentspeed.

2.Enchantres - is the same as chen only she can gain neutral only for 80 sec what is more then enough because CD for that spell is 30/25/20/15 seconds. Also she dosen't get any bonus stats for neutral.

3.Axe - this is unfriendly for newcommers because if you want jungle effectively with him you will need to stackcreep. I hope you know what stacking creeps means.

4.Broodmother - can also jungle, with her first ability on kill she will summon small spider wich will help her in jungling tougher neutrals.

5.Enigma - can easy jugnle because you can turn one neutral in to 3 elementals that will split in 6 after few attacks you just need some mana regen.

6.Darkseer - can jugnle, first you will need buy shield stout shield and some regen, start with some weak creep and ability for you jungle is Ion Shell, that will provide you dmg.

7.Nature's Prophet - well he got ability that summons trees so it's easy to jungle with him

You can also jungle with some other heroes, but i won't mention them because their a bit special.

another thing, i did mention it but what are the stealth detection items?

More than League. A lot more.

They don't give buffs in the sense of LoL, but several do have beneficial auras as well as activatable skills like stuns. If you dominate these creep and have them follow you around you can put them to work.

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care to elaborate

One releases in an AoE around the user and any unit will be marked. The marked units will be revealed as if they weren't invisible for a while. Another is similar to Oracle, except when you die it is dropped on the ground and anyone can pick it up, or destroy it. There are wards too, except they don't have a lot of sight but still reveal invisible units in a large area. There is also a pretty expensive item that as an added bonus has a unit you can summon that reveals invisible too.

All of these are rather inexpensive.