No horse I have ever bought or sold came with anything other than a clean halter.
Certainly no bridle or martingale was included.
I agree with Hali, buying a new bridle and martingale is not rocket science. Ask your friend if the tack you use is horse size (or cob, etc). Go to the store and buy what you need.
Why is this so complicated?
Buying appropriate tack is part of owning a horse.
Edit to add because the OP posted while I was posting:
Originally Posted by Jordan S
I just meant finding the right bridle not putting it all together. The one my new horse uses is differen't from the ones that my trainer used for the lesson horses.
What is special about it? Is the bit just different? Ask your friend whose tack you use to go to the tack store with you.