Advice/opinions please.

Im thinking of buying a well bred NH filly foal.

For certain reasons i cant go into her breeding but she has some serious blacktype from her 3rd dam with a lot of her offspring top NH types , 2nd dam bred one winner but 3 of her offspring have bred multiple winners although at a lowish grade,

Her own dam was poor on the track, but the only two of her foals to race yet have both won several times to date.

She also has 2 by a top sire and one by a decent sire that will come to the track before the foal im after.

The foals sire is a fashionable NH sire.

She,s a decent looking foal to my unproffessional eye.

I have horses and ponys but have never reared a thoroughbred before and im not sure of my long term plan with her. ie. selling as a 3 or 4 year old or hoping another of her siblings wins and selling sooner etc. or trying to lease her out for a few years to see what she can achieve herself and breed from her myself eventually.

Is it hard lease out a filly these days ?

Is it much harder rear a thoroughbred and are there any hidden or well known costs i would need to factor in.

Its something i have wanted to do for years but life and circumstances got in the way.

I think i could buy her for 3k or less.

Any comments/observations welcome and thanks in advance.