Yes, and No. Bulma was with Goku since he was a kid, and she was in her teens. She may have looked after Goku through their adventure, but I more or less think Goku passed values onto her because when they first meet Bulma is extremely selfish. As time goes on you see her slowly begin to become compassionate towards her friends.
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bulma is older
Yes. During the Tournament Goku states that he is 12, four years younger than Bulma who is 16.
Yamcha and bulma get together right after goku turns into a great ape in i think ....Episode...... 10
Chi-Chi, who is the daughter of the ox king. They meet early in the series when Goku was 14 when him and Bulma were trying to get the dragon balls.
The ship didnt have a name, but Dr. Briefs made it(Bulma's dad)