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If you are comming from LOL: [spoiler]
1. I think as a basic rule, carry a TP when you leave base. This will save you from ganks left, right and center. It will also help you to be an effective team player, allowing you to participate in ganks, and push lanes/defend towers which is an essential element in Dota2.
2. It's more important that you don't die early game, as opposed to trying to be too aggressive and going for that first blood.
3. A lot of new people auto-attack creep waves (meaning you push) early game, which is not beneficial (unless of course you are going for an early tower, and you have the mix to make it happen).
4. Denying is of course wonderful, but not worth dieing for once again.
Don't contribute to the already abusive community. Accept advice. Don't hate on the baddy. Everyone was new once. Spewing forth hate after a failed gank helps NO-ONE! Not you, not your team, not your neighbour, not the squirrel in the tree outside your window. Hopefully Valve never implement KD:R. Commend good players and report abusive players.
5. Don't buy boots as your first item. Buy tango's (HP/s), clarity's(MP/s) and branches(+stats). A quelling blade (for chopping trees + last hitting) is good, but only if you use it, and it is a fair chunk of your starting cash dollars.
6. As you mention, runes are incredibly powerful, so make sure you call misses.
7. A courier is essential to a smooth game, and you seriously gimp your mid if you don't have one. If you have to run back early on, you miss so much XP.
8. Wards will save you again and again. Someone needs to buy them, and if no-one does, take it upon yourself (Usually one person buys courier, 1 buys wards @ game start).
9. Jungle is very situational. Early game the jungle is *for your supports and your junglers**, not your carries. This is because the jungle is used by support to pull to give your carry solo experience in lane.
10. A ping on the map does not say, "I am ganking in 10 seconds. TP down". 99% of people will have no sympathy for you if you rage because you got no help and all you did was ping.
11. As a rule, don't tower dive (chase an enemy hero through one of their towers) unless you are sure or have a team mate to rely on. So many failed ganks...
12. Don't rely on your average pub player to save you, or make a great play. It happens, sure; but you will leave disappointed and angry if you roll like this.
13. Remember, a tower is worth a lot of gold, and should be defended.
14. Use your insight however, as trying to save a tower being pushed by 5 heroes by yourself alone is not going to help anybody. Also, towers are deniable below 1/10* (correct me if I am wrong).
15. *Every bit of gold counts, missing a creep kill here and there begins to add up. If you get every creep for the first 10 minutes, that's about 400gpm right there. Missing a single creep every creep wave brings that down to 300gpm.
There are also a few good console commands that may save you some time, and give you a little more information. Here's a link to a post containing them: http://redd.it/ltiul
And... I've run out of things to say. I imagine a lot of these things you may already know from LoL, but it's always worth mentioning them again and again so that people get to re-read them.[/spoiler]