For a first game, that seems like a pretty successful start. MV is right on score, but I would add that it's also a time thing. If you start from the earliest time points, it will be quite easy to accumulate enough titles to break 100k score by the end of the game in the 15th century. If you start in the High Middle Ages, it will be nearly impossible for a count or a weak duke to build a dynasty that accumulates that kind of power in such a short time period.
If you are looking to maximize score, try to marry your heirs to countesses and duchesses so that you inherit the lands in the next generation (accumulating more titles). Also, be on the lookout for when you can fight holy wars, especially against weakened Muslim powers in the area (or independent small Muslim states). You can grab a lot of territory quickly with that CB. Also, favor prestige-boosting event options as they come along.
Eventually, you might want to make a play for the Imperial title. You can do that via a faction if you have good relations with other dukes and they will back you, or you can try to marry into the imperial family so that you inherit a claim on the throne. Then it's just a bloody civil war away!