For Free players, I suggest using a rune kite.
Most likely your a member so Ill answer that as well.
First off you want defence, without hurting your bonuses. I will create a list from shields from best to worst (worst is still better than any sheilds not listed)
1. Unholy Book (Gained from quest Horror From the Deep, +8 Range bonus)
2. Any Spirit Shield (Good defence woithout hurting range bonuses)
3. Dragonfire Shield (Great Defence, Must I say more?)
4. Granite Shield (Same stats are rune kite, without hurting range)
5. Any other shield you can think of. The point is to get the balance between good def and range bonus.
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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