During the 10th century, you had 5 dukedoms in France. At the dawn of the Capetian era, you had only 4 left, so in 1000 A.D. you should have 5 dukes, but the title Duke of Franks maybe was still used by the French kings/heirs. One more was added in 1088, and afterwards, lot of them went extinct, merged etc, tough act to follow.
Counts were usually quite low in the social ranking of medieval France, unless they were counts of Flanders, Champagne or Toulouse. Those were peers, but the oldest one I can find is from 1156. So I guess they were not very relevant before that.
Barons were very numerous and almost "lowest" noble there was, for a fun fact, a Baronny could be sold to a commonner which then became Lord of the Baronny and not a Baron, the seller would lose its title and no such Baron would exist as long as no Nobles held the land where the seat of power was. Some Barons could hold several baron titles, and in fact, many Dukes and Counts were Barons and Marquis, too.
A "typical" baron is thus quite a difficult term. They could be managing a little Fief with maybe 100 people living in it, or managing big regions. Depended on the title (baronies could be very unequal) and if the holder had more titles unders his belt.
The dukes were indeed as powerful and most of the time stronger than the king, it took a LONG time for France to become an absolute monarchy and for dukes to be much weaker than the King. BUT the French king was the first among peers, supposedly.
The dukes of Normandy and Aquitaine under House Plantagenet were the most famous powerful dukes that challenged the French Crown, most notably with the Hundred years war. Before that war, Richard the Lion-Hearted most famously challenged Philippe-Auguste and was considered much more than an equal for the french King. The Duchy of Aquitaine was at one time considered a different kingdom altogether, much richer than the rest of them, when one French King married to the heiress of the Duchy, most people wondered who was the most honored of the two, the Duchess who married to a King or the French who got Aquitaine "secured" ?
Other notable powerful dukes were the dukes of Burgundy, which at one point declared themselve Kings, look for Charles the Bold (and his famous demise). The dukes of Brittany were very important for the French Kings and were maybe the "loyalest" of Dukes for a long time. Dukes afterward varied in power, but the Bourbons were strong enough they became the dominent power in France after some times, so there's that.
In 1000 A.D. the French King was Robert the second who had small holdings as crown lands, he had thus much less income than all of the dukes, he inherited the duchy of Burgundy later in his reign (but his heir would give it to his brother) and managed to gain some counties, notably the county of Paris, he had authority upon his peers but most likely was too weak to keep them in line. He famously had trouble to claim the duchy of Burgundy and had to resort to a Church Ruling to inherit it, since he didn't manage to conquer it. He managed to stay the king by allying a lot with his vassals, which he treated more as equals. He's maybe one of the Capetian kings we know the less about, his wikipedia page should give you an headstart to find whatever else you wish.
List of dukedoms in France , Peers of France , Robert II (the French link has a lot more details)