Often the materials are based on a case that you will gain one skill point each craft. This won't happen, so you will have to buy a few extra materials while you are leveling your Pandaria Leatherworking.
Pandaria Leatherworking Trainer
You can learn Pandaria Leatherworking from Clean Pelt at the Grummle Bazaar in Kun-Lai Summit.
Approximate Materials Required
This is the list of approximate materials required to reach 75.
Visit my Exotic Leather farming guide if you want to farm the leathers.
1 - 11
10x Sha Armor Kit - 40 Exotic Leather
11 - 30
22x Misthide Bracers - 110 Exotic Leather
Might need to make a few more to reach 30.
30 - 36
6x Misthide Gloves - 48 Exotic Leather
36 - 51
15x Misthide Chestguard - 150 Exotic Leather
51 - 75
24x Contender's Leather Bracers - 288 Exotic Leather
You can get Spirit of Harmony by combining 10 Mote of Harmony. Motes are dropped by every mob in Pandaria, even in dungeons. The drop rate is low, so it may take you 10 minutes to collect 10 motes, but you can buy these from the Auction House, or check out my Spirit of Harmony Farming Guide, if you want to farm them.
Congratulations on reaching 75! Please send feedback about the guide if you think there are parts I could improve, or you found typos, errors, wrong material numbers!