All of this is in previous threads and you have probably read some of it, so that is a good place to start.
A lot depends on how much you have to spend, so figure that out first because advice on a cheap bow will be different than for an expensive one. Also it depends on how much you are going to use it. If you can try both French and German first, do that before settling on either. My hand is more relaxed with the German bow. Also, bowing doesn't come natural to most folks, so a teacher is a big plus.
My experience: I didn't have any clue whether or not I would even like to use a bow at first, so I found a teacher and he recommended the least expensive fiberglass one with horse hair as a starter bow. The feel is very inferior to wood, but for a while, you probably won't know that. I used it up in a year (the frog broke) and I really liked bowing so I replaced it with a better one made from Brazilwood and supplied by Bob Gollihur. These are quite popular it seems because of the quality/price ratio. Great medium quality bow for the bucks. These are full size and have good weight. If you want to spend considerably more, then there are lots of personal preferences to consider. Pernambuco bows are considered the best. Fully lined frogs are also considered better. Black hair is preferred by some, some split the difference and most use light horse hair. More people use French than German, but I think many teachers using french bows and teaching bass, but not specializing in bass might be more responsible for that than any other factor.
You will also need some rosin, so read through some of those threads too. Ray Parker bows on Spiracores and posts frequently here. He also plays an EUB on occaision so you might search for his posts on this forum to find out what his bow/rosin combination is. Also look at the EUB threads. I hope that helps and best of luck.
Newbie needs bow advice 
