The most obvious benefit to becoming a ghoul is the access to the regnant’s Disciplines. The first discipline dot (which is free) must be the first dot in the physical Discipline that is in-clan for his regnant.

Aside from that first dot in a mandatory physical Discipline, the second dot is available from a wider variety although it COSTS AS MUCH AS IT DOES FOR A VAMPIRE (10 XP for in-clan, 14 XP for out of clan).

If, when he creates the ghoul, the ghoul’s regnant is an active member of a bloodline — be it his sire’s bloodline, a clan bloodline or a bloodline of his own inception — the bloodline’s Disciplines are all considered inclan for the ghoul’s purposes. (So yes, if a Morbus vampire makes some poor bastard a ghoul, that ghoul can have one dot of Cachexy on top of his single dot of Celerity at character creation.)

Daeva:	Celerity, Majesty, Vigor
Gangrel:	Animalism, Protean, Resilience
Mekhet:	Auspex, Celerity, Obfuscate
Nosferatu:	Nightmare, Obfuscate, Vigor
Ventrue:	Animalism, Dominate, Resilience

Remember, each dot beyond the initial outlay is purchased at a cost of [ 5 (in clan) / 7 (out of clan) ] experience points times the number of dots you wish to purchase. For example, if you have three dots of a discipline and wish to purchase your fourth dot, then the cost is (4 x 5/7XP) = 20/28 XP.

Any discipline over 4 dots requires an explanation for the basis of that discipline in the character's history. Since this is a GHOUL, that would be one helluva story.