My answer would be to ignore that "My Rank" button, get out there and make some decent stuff! What you upload depends on what you're good at or what you enjoy. But remember the basic rules:
For Skins1.Dont make steve skins. Not only do they look bad, but they'll probably get removed. This includes Herobrine skins!
2.Dont make mob skins. They look terrible and they are going to get removed too, unless you're junkboy, which I highly doubt.
3.Dont steal skins. This includes taking someones skin and modifying it without their permission.
For Texture Packs1.Dont steal others creations. This is either the full pack or just some textures.
2. Dont upload xray packs. These are against the rules.
Those are just a few examples of the rules, but read the fulll set
HERE