How do I write a balanced equation forA) H2SO4 + CaCo3 > and B) H2O2> H+02

well, most importantly, you need to write the compound correctly.
CaCO3 not CaCo3, H + 02 is actually H2 + O2

H2SO4 + CaCO3 --> H2CO3 + CaSO4 --> H2O + CO2 + CaSO4
H2O2 --> H2 + O2