will I bleed if I masturbate for the first time?

If your only masturbating by stimulating your clitoris you won't.

It would depend some girls can insert and remove tampons an not tear the hymen where as others just gently fingerings will, some girls hymens have already torn or worn away naturally just from every day things like riding a bicycle, horse back riding, leg stretching exercises that open the pelvis up or gymnastics. You can always check to see if your hymen is still in place by sitting on the floor feet wide apart, knees drawn up to your chest then place a mirror in front of you so you can see your vulva if you need more light place a flashlight on the floor next to the mirror then spread your lips and you should see your hymen partly covering the entrance.
If you don't know what it looks like just Google what does a hymen look like.

I can't really answer that question because as I said some girls can insert tampons an not even bleed but do the first time they have intercourse, is there a reason why your worried about it causing you to bleed?

No, I just want to know.

As I said I can't answer it but if you do it won't be that much.