In my experience, the Butler (German) bows make it easier to apply weight to the bow due to being able to use your thumb for leverage, while the French bow is easier to finesse smooth bow changes, spiccato, and staccato styles. In the hands of a great classical upright bass player, either style of bow can be played beautifully... mostly a matter of personal preference.
As others have said or hinted at already, somethings to consider...
1. Bow angle - typically, you want to keep the bow parallel with the bridge and perpendicular to the strings.
2. Hair angle - tilt the bow towards your face/away from the bridge so that the stick is not quite directly over the hair and the edge of the hair closest to the fingerboard contacts first. For soft playing, you don't need to have all of the hair on the string. Add more weight to the stick (with your arm, not by taping weights to it!) to get more and eventuall all hair on the string for forte playing.
3. Contact point - generally, the more weight you place on the bow, the further away from the fingerboard and the closer to the bridge the bow should be.
4. Bow speed - most beginning and intermediate bassists use too much bow speed, especially if they're used to playing other stringed instruments (violin, viola,cello) first. Find the combination of speed, weight, location, and angles that give you the clearest, fullest sound. They are all related.
5. Rosin - It's important. Gary Karr (one of the world's greatest ever bassists) has said the he doesn't need rosin, but he's insane. Again, experiment. It must be bass rosin, not violin or cello rosin. It comes in different hardnesses. Try a medium. Cold temps require softer rosin. A few light swipes on the length of the hair, then play a bit and see how it feels. ALWAYS wipe off the body of the bass, then the stick of your bow, then the strings after playing. Rosin is a necessary evil.. it'll build up fast and really make maintaining the finish of your bass and stick difficult,and buildup on the strings makes it tough to control your sound.
Just some thoughts. Enjoy!