im not too sure when you asked this but if this is a long time ago then i would say killing monsters for it(certain ones for shields and certain ones for certain shields)or buying it from ther players.if this is like now or recently so like 2008 or 2009 then buying from players is fast and from the grand exchange.
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Their are shield shops all over Runescape. You should be more specific.In North Falador near the fountain.
An elemental shield is 845 gp.
The best shield for a non member in stat wise is the Rune Kite shield however if you want rarity the You can go for one with a trim in the colour of the runescape gods.
Sword: Rune 2handed sword. Shield: Rune Berserker shield 100.
A shield or a prayer book. sheild, book and 2h sword