It is hard to answer this question without knowing more about your preferred fighting style and whether or not you want to participate in packet combat. Also, "starting" is kind of a nebulous term. It can mean a fresh 15 build character, a low end character with anywhere from about 40-50 build (gained from roughly one year of NPCing before making a character, or even a mid-low character with about 75 build (usually gained from NPCing multiple chapters for a year).
Also, I don't know whether you mean just what skills you should start with or whether you are asking what skills you should learn during your first year or so.
I am going to try to answer as comprehensively as possible to cover any and all bases, but you may find some of this answer overkill.
Scouts tend to work best with archery builds (because bows add both backstabs and proficiencies to damage) and two weapon fighting builds. Now, don't take that to mean they can't work with other builds, just that the various benefits congeal the best for the above. Other workable options include poison/fighting combo, two-handed weapon scout (offering really good damage both from behind and front), and weapon trick builds (basically tons of "prepare to die" skills).
The first big question is whether or not you want Waylay. It uses a large chunk of BP (6) for amazing utility in some circumstances and none in others. I can't make a recommendation here because I don't know whether your play style can make it work. Just know that if it can, it is definitely worth the cost.
Beyond that, you should spend your initial BP on your weapon of choice and your play style. If you have any points left over, grab a critical attack so you don't need to be taught it later. In general, you want to buy both profs and crits split no worse than 30/70 (any split higher than that and you are better off as a pure rogue or pure fighter, in terms of BP cost). I personally play a 60/40 towards rogue skills. However, in the early levels, unless you are VERY stealthy, you should start with proficiencies, purely for utility purposes. I recommend at least 2 before starting to buy rogue skills.
Once your character has about 90 BP total you should have 2 profs, 2 backstabs, and a weapon style (and a few racials) and you will really start to feel like a scout (rather than just a fighter). This is usually where you can begin to define your character. Start looking at once per day skills like parry, evade, dodge, eviscerate, slay, shatter, disarm, stun limb, etc. Pick the ones that feel like they make the most sense for your character. You also want to start to think about whether you will stay even split on fighter and rogue skills or start to tilt one way or the other. Scouts are particularly good at defensive skills (having access to dodge, evade, parry, and riposte), but that doesn't mean they have to be built defensively (just that they excel at it if that is your desire).
Continuing in next post....
-MS