Do I have a good donor area? How many grafts can I pull out? (Photo)

Photos cannot assess if you would be a "good" candidate for surgery.  Usually this involves seeing a doctor in person so you explain your clear goals to the doctor and the doctor can give you a realistic expectation.  2000 grafts may be fine for others but you may not be happy if your goals are way off.You also cannot assess donor hair quality with photos.  You need a microscope for this.

The most important thing at this point is to halt the progression of further loss and maintain what hair you have.This can be accomplished with adjuncts such as Minoxidil,Finasteride,Low Level Laser therapy and/or PRP(Platelet Rich Plasma) . I would not recommend a hair transplant at this point.I suggest a thorough evaluation by an experienced Hair Restoration surgeon in order to design an appropriate treatment plan.

Most probably you have a androgenetic type hair
loss. I dont advice to use finasteride because of
possible side effects and being under
the necessity of using that chemical for almost life long to stop hair
loss.You may start to use minoxidil %5 to thicken the hair and stop hair
loss.Yes your donor site is little poor nad hair is not thick but  we are able to get enough number of follicles to restore preexisting hair. Hair transplant can be an option for forehead reduction and correcting  asymmetry on your frontal hair line/forelock.I advice you have a FUE with 1200- 1400 grafts; you would get the desired hairline in just one sesssion of dense packing hair transplant. 

your are too young for hair restoration at the moment specially with receding hair line...as with time you will loose more hairs than you might need another session....so better wait for another fee years to get the maximum benefit from 1st session....
In case you want now your donor is quite good and you can have 1500 to 1800 grafts in your hairline for decent density...

If your hairline is still actively receding (which is sounds like it is, and will continue to for a while since you're only 22) then it's not advised to get a transplant along your hairline. You'll be left with a band of hair in front while the top of your head continues to recede. So it's best to wait until your hairline has become stable (either by waiting for it to do naturally, or stabilizing it earlier through the use of medication).

See a qualified hair restoration specialist. Pursue medical options for hair restoration at this point. Age 22 is too young in most individuals for hair transplantation. You are losing hair actively at a young age and that will progress. Looking at your family history of hair loss on both sides of your family will help understand where you are headed from a hair loss perspective. One of your pictures shows slight thinning in donor area, this needs to be assessed by a dermatologist or full-time hair restoration surgeon to rule out other causes of hair loss.

If you are balding it is early. To find out definitively, get a HAIRCHECK test which will be definitive, see below. At 22 you should not consider having a hair transplant because it is progressive and what you see now will not be what you see in 3 years.