[misraa]

I'm trying to make a galvanic cell using 0.25M of lead(II) nitrate and 1M of iron(II) sulfate. What I don't understand is how to get the half reactions and the standard reduction potential of the lead nitrate

all I figured out was the lead is reduction cathode: Pb2+ --> Pb

 and iron is the oxidation anode: Fe3+ --> Fe2+

[Aldebaran]

Have you tried Googling standard reduction potentials? There’s lots of data easily available. Also bear in mind that standard reduction potentials require standard conditions which includes concentrations amongst other things.