When enhancing with fletcher and carp, you just need the boards or logs in your pack and the proper tool.

Enhance what? And I'm gonna try and find out if there's anything that uses white pearls for enhancement. You could be thinking of the Pendant of the Magi that's made with the white pearls?

and there is a white pearl bracelet as well it gives you NS and some other small properties..nothing stunning.

You can enhance with ingots but it only affects the damage %'s over the various elements.
And horned, barbed and spined leather you can use on items of leather armour you find. Spined for luck and generally barbed for resists.

No enhancing with anything other than wood/metal/leather and only according to which applies to whatever your enhancing.

Wood is the only one which adds properties/modifies damage distribution/adds resists, metal and leather just add resists to armor, and metal only modifies damage distribution.

You can use any of the jewels from mining/chopping/fishing to craft jewelry. The web is woefully underpopulated with info on this, but I do know that crafting bracelets (possibly ring) with an ecru citrine can give you 75% enhance pots.

For crafting from runics ben, yes, you can enhance a runic crafted item after it is crafted. But why would you? You have a HUGE chance of failure then. It is best to craft it from the material you want to enhance it with.

ecru citrine ring can give you 75% enhance pots Its a ring

Oak by Weapons :
40 Luck
Damage Increase 5%

Oak by Armor Parts :
40 Luck
Physical Resist 3%
Fire Resist 3%
Posion Resist 2%
Energy Resist 3% (11 Resists Total)

Oak by Shields :
All Resists +1%

Ash by Weapons :
Swing Speed Increase 10%
Lower Requirenments 20%

Ash by Armor Parts :
Lower Requirements 20%
Physical Resist 2%
Cold Resist 4%
Poison Resist 1%
Energy Resist 6% (13 Resists Total)

Ash by Shields :
Energy Resist 3%
Lower Requirements 20%

Yew by Weapons :
Hit Chance Increase 5%
Damage Increase 10%

Yew by Armor Parts :
Hit Point Regeneration +1
Physical Resist 6%
Fire Resist 3%
Cold Resist 3%
Energy Resist 3% (15 Resists Total)

Yew by Shields :
Hit Point Regeneration 1
Physical Resist 3%

Heartwood by Weapons :
Only one of the following Random abilitys :
Spell Channeling -1
Swing Speed Increase 10%
Damage Increase 10%
Hit Chance Increase 5%
Luck 40
Hit Life Leech 10%
Lower Requirements 20%
Weight -2

Heartwood by Armor Parts :
Only one of the following Random abilitys :
Spell Channeling -1
Swing Speed Increase 10%
Damage Increase 10%
Hit Chance Increase 5%
Luck 40
Hit Life Leech 10%
Lower Requirements 20%
Weight -2
Physical Resist 2%
Fire Resist 3%
Cold Resist 2%
Poison Resist 7%
Energy Resist 2% (16 Resists Total)

Heartwood by Shields :
Only one of the following Random abilitys :
Dexterity +2
Strengh +2
Spell Channeling -1
Cold Resist 3%
Physical Resist 5%
Reflect Physical Damage 5%

Bloodwood by Weapons :
Hit Life Leech 16% (it add's not up, if your Weapon has already Hit Life Leech)
Hit Point Regeneration +2

Bloodwood by Armor Parts :
Hit Point Regeneration +2
Physcial Resist 3%
Fire Resist 8%
Cold Resist 1%
Poison Resist 3%
Energy Resist 3% (18 Resists Total)

Bloodwood by Shields :
Hit Point Regeneration +2
Luck 40
Fire Resist 3%

Frostwood by Weapons :
Damage Increase 12%
Physical Damage 60%
Cold Damage 40%

Frostwood by Armor Parts :
Physcial Resist 2%
Fire Resist 1%
Cold Resist 8%
Poison Resist 3%
Energy Resist 4% (18 Resists Total)

Frostwood by Shields :
Spell Channeling -1
Cold Resist 3%