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1 Does antiparticles all have negative energy? And the energy we talking about here is the rest mass energy? If it is, does it means antiparticles have negative mass since E=mc^2 ?

My understanding on annihilation is simply two particles (one normal, one anti) collide, vanish and form new particles (photon or other bosons) to conserve momentum and energy.

2 If the answer to question 1 is yes and yes, then I assume the rest mass energy are cancelled, the new particles only have the kinetic energy of the old ones? And what if the kinetic energy of the old particles are not enough to form a new pair?

Please correct me if there is any mistake, thanks