Lvl 20 Guardian Needs HelpFollow

I have a lvl 20 Gaurdian. I have almost all my vangaurd armor escept for my bracers and boots which I think I'll get during the Armor Quests. Right Now I have about 900 AC and most of my defense buffs are apprentice ones, another problem which might be holding me back is that the left side of my inventory is all very crappy. Here comes the problem, I'm not sure of many ways to make quick cash so by the times I get enough money to buy new spells It wont matter because ill be way behind when it comes to my eqiupment and once i save enough for better equipment I'll be stuck with outdated spells. It seems that I am in a rut. Right now my guys really isnt much of a tank and I was just wondering if I could get some advice.

Quest, not much else I suppose. Good way to boost your ac and other defensive stats is doing the heavy armour quest. Although the first two are relatively easy, it will get pretty hard.

If you get money, buy the spells but selectively. See what spells would be handy for the purposes of your gamestyle (solo or grouping, but armour quests will require grouping ofcourse) and try to update those first. (if you can find them that is)

Sell what you find, not only to vendors but to other players, plenty use for harvested items, adept spells and armour parts that you get from drops.