Thank you for the opportunity to help you with your question!
1. First, it's good to know which bases pair with each other. C will pair with G and vice versa. T will pair with A. A doesn't pair with T in mRNA however, because T is replaced with U. So in this example the pairing will be:
Now that you have the mRNA sequence you can find the peptide sequence. Peptides are encoded by 3 nucleotides or codon. So if you break the mRNA sequence up into groups of 3 you get:
GAG CAC CAA AGU UGG
Each of these corresponds to a peptide. Usually you can find which sequence corresponds to each peptide on a chart online. Using a chart like that it can be found that the peptide sequence is: