Guardian Angels

[Kazbadan]

I have no idea where to post this, so i will put it here:
Do you believe in guardian angels?

If so, i have some questions:
-how are they and who are they?

-can we see (besides astral proejct) it or speak with them?

-if we speak with they would they respond?

-how can we invoke or call for them?

-is it possible that we may find a bad angel?

-how can we have shure that we talking or geting help from in, instead of just getting luck in some things(and thus thinking that it was because of the angel)
thanks