You can't legally do it for others until you are certified.
To do this, you need to attend a school.
Schools are expensive, I can't county how many people I knew that got into taxidermy and got out of it twice as fast.
Jordan Taxidermy is probably the best school to attend.
If you are that poor, you would probably need to move to Punxsutawney to be able to afford to attend school there. It is too far out of town to walk, and it gets too cold in the winter to ride a bicycle to school from town.
Maybe you could find temporary employment working at WalMart , Sheetz or one of the fast food restaurants.