joined jazz band for 2 weeks now, i`ve been assigned a solo (which i have to make up). and i just need something to help me. im not good with making up stuff!

Improvisation isn`t something that you can pick up in two weeks. It takes years and years of practice, and even then there is still practice that can be done. John Coltrane used to practice four hours a day, even after he had established himself as a jazz great.

Anyways some things that might help:

Think of the chord changes as scales rather than chords. Practice with your metronome running the appropriate scales and stop only to take a breath

Transpose the chords into concert pitch, and play through them on the piano. Play the root in you left hand and the third and seventh in your right. This will help your voice leading (7th resolving the 3rds).

Practice arpeggiating the chords with your metronome. Don`t stop at the octave, play the 9th, 11th, and 13th as well.

All these exercises are used to help you "hear" the chord changes. If you memorize the changes it will help you greatly (when I say memorize I mean finger memory).

The most important thing to remember is to play what you hear in your head. If you don`t hear anything then don`t play. Don`t be afraid to use rests in your solos. When you hear pros play, and they don`t use rests very much its because they can hear ideas in their head and play them very quickly. Other people require rests to think of ideas to play. Hope this is some help.

i`m sry, i don`t quite understand. chords? i don`t know these. im sry

Wow....you don`t what chords are?.....how old are you/grade? please say 7th grade.

Get lessons and get them fast is all i can say.

Just calm down, All you really need to know is the blues scale for a beginner. And this you actually can learn in a matter of a week, I`ve seen it done on several accounts. Assumming "school" is not a collegiac level band, the pattern:
1 - flat 3, 4, #4 / flat 5, 5, flat 7 - 1. In whatever key you`re playing in will hit chord tones in most of what you will need to know.

if hes a begginner u think those numbers mean nething to him? give an example
the C blues scale is- C, Eb, F, F#, G, Bb, C
If you search online a little bit i`m sure u could find the rest of the scales and their notes.

just use the b flat blues scale. trust me it works every time.

Can you give me the note names for the Bb Lydian Dominant Scale?

Bb lydian dominant is Bb C D E F G Ab Bb. Lydian dominant is the fourth mode of melodic minor, it`s a dominant scale with a raised fourth.