Can I put some of my goldfish water and gravel into my betta's tank?

No, the Goldfish water doesn't have beneficial bacteria in it, the bacteria only grows on surfaces in the water. The gravel may help if it's not dirty from the Goldfish. Doing 40% water changes everyday until your ammonia levels are safe would help more.

It wont make a huge amount of difference i would do 50% water changes daily that half's the Toxic ammonia in his tank

No. Goldfish are extremely dirty, and Bettas aren't immune to their diseases. Get fresh gravel, fresh water (dechlorinated, of course), add pH balance and ammonia neutralizers. You can find all these things at PetsMart.

not the water or the gravel, but some dirty filter materials from the other filter would be helpful and will hurry the cycle along a bit. do a partial water change right away before putting in the dirty filter materials, and reduce your feeding until the betta tank finishes cycling. (do the water change first to reduce the ammonia level) note, although there are bacteria in the water and on the gravel, the majority live on the filter materials and that's where they grow best and clean the water best. If you can't use the filter materials, then yes, a little gravel may be helpful.