Do not take out any items that you cannot use.
Do not take out items just to sell or disenchant.
Do not put in any green items that dont have any special ability, they will be sold and money will be put in vault to buy future tabs.
Do not put in bags with less than 10 slots in vault, they will be sold and money will be put in vault for tabs.
Do not put in more than 3 stacks of any item unless its an item you think will be in high demand later on.