My cat requires vet attention

Hello and thank you for taking the time to read this...
My name is K, and I have this cat, I call him Edward and he need veterinary help. I do not know how old he is, as I found him as an adult stray and began to feed him. Eventually, he got close, and he is as sweet as can be! 
Recently, he came to me being unable (or unwilling) to walk on his right leg, and upon further inspection there seemed to be a wound right there hurting him alongside swelling of the area. He wouldn't let me touch the area or pick him up after he got it.
I am very worried about him and need to take him to the vet. Upon taking him to the vet for his leg I would like to get him proper shots and help for what I presume is a skin condition (scabby right over the neck area, rough and bumpy to the touch). 
The cheapest this would be is about $300 and therefore it is all I am asking for. 
So, for the sweetest cat in the world, I come to you for help.
Thank you so much.
https://www.paypal.me/ChoklitFactoryy