There are tons of options! Here is a few with skill requirements:
Woodcutting- Get 60+ and cut Yews, as of September 26 they go for 509 gp each
Fishing- Get 40+ (slow) and fish lobsters at Karamja Docks, as of September 26, they go for around 175 gp each
Mining- Get 85+ and mine runite ore, As of September 26, they go for around 13k each, that can make you 1m per hour, you will as a non member have to go in wilderness
Combat- Fight cows, drop cowhides- 215 gp each
Fight Hill Giants (Level 28) Moss Giants (Level 42) and pick up "Big Bones" As of September 26, they go for around 700 gp each
Magic- Get 55+ and alch Air Battlestaves, they are around 8k each, but you will make a 100 gp profit off of them
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Greater demons drop Rune Full Helms and Rune KitesLesser demons drop Rune Med Helms (Rune Helms)Cockroaches drop Rune Square Shields and Scimitars
for non member: if you want to up fast in str use rune scimi if you want to hit more use long rune sword if you want to hit greater use rune battle axe and 3h rune (dagger and short sword are faster than scimi but scimi hits higher and better) for member: The best way to up in str is dharok
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.
Full Rune is the current best melee Armour for free to play characters.
Rune Berserker shield 100 is the best you can get in f2p. You can get it from Fist of Guthix by using 300 tokens or buy Rune berserker shield 0 from Grand Exchange and repair it in Fist of Guthix to 100 by using the Rune berserker shield 0 to the 1 who sell's the stuff? Was it Reggie?