For now that's fine, except use Heroic Opportunities (HOs).
Start the fight w/ the flank attack one (sneak attack I think) - use stealth mode to get behind hostile mobs - if fighting ones that don't attack u on sight just walk up behind them normally.
Once the fight starts hit your HO starter (lucky break?). Then hit Evade to advance the chain, then quick attack. That finishes the HO, does extra damage, and sometimes buffs you. Do that as often as you can. You can kill yellows, maybe oranges - and green ^^ mobs (says "group" but there is only one of em).
Upgrade your abilities asap. Buy apprentice 2 from "trainer" in your town and scribe them. Now they hit harder. Do more damage. Players make even better versions. App 3 and App 4. Adept lvl 1 upgrades are even better and drop of monsters (chests). Adept lvl 3s are insanely rare (made from really rare mined items) and sell for 15 gold each and up! Mastery - dropped by monsters in chests - super insanely rare. Cost even more. At least get app 2 for the ones you use a lot. Try to get App 4 or Adept 1 for the ones you use over and over - join a tradeskill society in your home town - these are the little hatches in the ground - talk to the npcs by them til u find the one u can join - say yes - enter - find the broker - search - see what players are charging for what u need. Scouts use "Runes" as upgrades - aren't always a ton of those for sale. U can go into antonica/commons and /auction that u are buyin em, too. You may need to work at this, it might not come easy.
Also get poison. Look around and find a poison seller. Try to get poison - wait,this is lvl 10 and up. At that point get poison, "equip" it then "use" it. Try to get it your lvl - like white or yellow to u - not green. Oh poisons are all different - and go by colors - this is gettin confusing - not the "how does it con to you color code" - but just colors to show different tyes. Purple is probably the best poison. Buy a purple poison that cons yellow or so to u - that's good. It procs damage as u fight - lasts many hours - it's very good.
In groups you just max out your damage and Evade when the mob gets on you (makes it go back to the tank).
If the group is doing HOs you need to learn your part. Search for other posts on this.
Once you get the one that stuns your target, u can use that to get in a second flank or backstab.
Once you get backstab try making a macro w/ both backstab and sneak attack. W/ the macro's speed it might be possible to get em both off before the target turns on you (there is a slight delay before it turns). Give it a try anyway, i've read some scouts saying it works. It may not.
Remember the scout can change the HO effect with a "coin" ability (do rt click and examine to see the secondary icons for HO purposes). Er, you can cancel the first wheel and get a shot at a better one. This is pretty advanced stuff, so don't feel bad if you don't get it right away. I'll post a good link for you on HOs, but basically if the group is really good - you as the scout can blot out gimped HO effects and get more killer effects for the group - like really huge damage hits. Or group heals. Etc.
http://www.gnorrath.com/ thats the good HO link. GL