Luckily for you I came across this thread.
I shall describe some BASIC pures that you could start selling in their early stages.
Basic F2P bounty hunter str pure.
Attack - 40, and EXACTLY 40.
Strength - 60, do not put it on sale before 60.
Defence - ONE.
Prayer - ONE, or 31, no higher.
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 40.
Basic P2P DDS'er.
Attack - 60, NO HIGHER.
Strength - 65+, do not put it on sale before 65.
Defence - ONE.
Prayer - ONE, or 31, no higher.
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 40.
Basic P2P Granite Mauler -
Attack - 50, and EXACTLY 50.
Strength - 60, do not put it on sale before 60.
Defence - ONE.
Prayer - 31.
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 40.
Basic F2P Ranger.
Attack - one.
Strength - one.
Defence - ONE.
Prayer - one.
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 60.
Basic F2P Range 2h'er. (the will sell for alot)
Attack - 40, and EXACTLY 40.
Strength - 60, do not put it on sale before 60.
Defence - ONE.
Prayer - 31
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 60
P2P Ranger.
Attack - 1
Strength - 1
Defence - ONE.
Prayer - 1
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 70.
Basic F2P Tanker.
Attack - 1
Strength - 1
Defence - 40 (with dragon slayer DONE)
Prayer - 1
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 70
However, you might want to get 40 attack and 60+ str for the KO.
Basic P2P Tanker
Attack - 1
Strength - 1
Defence - 40
Prayer - 1
Hitpoints - Whatever it comes to.
Magic - 32.
Range - 75
I hope I could help, contact me at my MSN if you need more help.