What happens after mRNA is translated into tRNA?

mRNA is a  temporary copy of the "recipe" for making a gene product.  Suppose you are Mrs.Field's of cookie making fame.  You have the chocolate chip cookie recipe in the vault at the bank.  Every time you want to make a batch, you have to go to the vault and copy it, but you only want it to be a temporary copy.  As soon as you are done making a batch, it is destroyed.  So the cell's nucleus is kind of like the vault, and the mRNA is kind of like the  temporary copy.  It can be copied many times by ribosomes simultaneously, but it breaks down in the cytoplasm quickly and needs to be made over and over.

mRNA isn't translated into tRNA. tRNA is what binds the amino acids and then attaches them to the elongating chain in the ribosome.

mRNA comes for DNA. Then, the mRNA goes outside the nucleus to the ribosome. tRNAs make their way to the ribosome with amino acids attached to them, and hook those amino acids together based upon what mRNA sequence there is inside the ribosome.

So no, tRNAs are not created from mRNAs. They are separate entities.