If my blood type is b+ does that mean my sons and daughters blood type is b+?

Nope: Blood type is surprisingly complicated. Not only do your kids inherit their blood type from both you and their father, the genetics of blood type is not as straightforward as it seems. Here's a picture to help illustrate this. Here is also a pretty good page from the red cross on this topic. http://www.redcrossblood.org/learn-about-blood/blood-types.

Depends: Blood type inheritance for your children depends not only on your genes but the father's. It's possible that your children can be type b, but it's also possible for them to be type a, ab, or o. More information is needed.

No: It depends on your husband's blood type as well. Your child could be your blood type, your husband's blood type, a mix of the two, or o. See http://www.Redcrossblood.Org/learn-about-blood/blood-types to see the possibilities.