World of Warcraft Money help!?

I am now a level 40 paladin and i want to buy my new faster mount, but im a little short on gold. I only have 37g. My professions are herblore and mining but i dont get much money from this account, i usually get it from my druid who has herblore and skinning, but im barly getting any money, can anyone help on how i can get 45g for the mount and have enough money left over to carry on with normal things?