RDM Tips Plz

Okay, I have had Red Mage 75 for a good while now and have always accepted it as my gimp 75. Now, I am having to use it quite a bit for different scenarios in my linkshell and I need to make it better. If any experienced RDM could give me some gear tips and even some skill tips it would be appreciated. For gear I mean as in anything, any sets of gear I would need to be successful and skills of any sort.