How can I solve thus equation? can anyone help me please

Here is the equation that i want to solve (m^2)r^4+(m(c1+c2))r^3+(k1*m+k2*m+c1*c2+(a^2)*(q^2))r^2+(k2*c1+k1*c2)r+(k1*k2)=0 how can i find the roots r if any variable is constant except for q is range from zero(0) to 10000 and then i need plot only the imaginary result to the variable q. Thank You