CCL: Carbocation calculations, an approach

Dear colleagues.

My apologies if I disturb you with a couple of questions.

I have never worked with carbocations, but now I have a good case to start

I would like to answer some chemicals questions using computational chemistry, but unfortunately I obtained rare energy values.

Could you tell me please, what should I do? or what kind of chemistry model should I use?.

I want to answer some questions:

*Which reaction is the most probable to happen?
*What energy is necessary to reach transitional compounds before obtained products?

I have performed some calculations using this:

# opt=tight freq b3lyp/6-31+g scf=qc  with the respect spin multiplicity, but my calculations told me that compound A is most stable than B, besides compound C is most stable than A and B. I stopped here because I think that is impossible.

A: is a carbocation very similar in structure like B
 B is not a carbocation
C is a carbocation product of A+B

Final energy for A = -195.60813

Final energy for B = -195.27260

Final energy for C = -390.92315

Thank in advance for your time. Maybe if you don´t have time please recommen me one good paper or good tutorial.

Best regards.