1) Do a search, this has been dealt with many times. Basically, in a routine stop, it's not an issue. HOWEVER, if you are asked to get out, calmly tell the officer that you have an LTC and you would like to know how to proceed. DO NOT say "I have a gun". Do whatever the officer tells you to do.
2) First off, you failed. The whole deal with concealed carry is that NOBODY KNOWS. Not your friends, not your priest. MAYBE, your tailor and doctor, but that's about it.
That said, most sheep don't realize what it is. If they do, and make a coment or act odd, just say 'It's licensed.' Anything more than that will involve the boys in blue and you do what they ask.
Do not take this at all lightly. If you carry, that is YOUR knowledge only. The object of the game is to go through life without EVER having another person find out. If you are anticipating the moment to use it, you have the wrong mindset. You should be looking for ways to AVOID ever using it. You will become meek and humble and say a lot of "I'm sorry" and "My error" and leave places that don't feel right. You will be alert, but avoid confrontation.
A gun is the VERY LAST answer. The number of times it is the correct one is statisticly insignificant. So why bother? Because when it IS the proper answer, no other answer will do. Same reason I have Fire insurance on my home. I never ever expect to use it, but I'll be damned if I don't prepare.
Take some training. You sound like you still have a lot to learn, and forums are not the place to do it. Suck it up and spend the week up at LFI in New Hampshire. Then, you might have enough knowledge to ask the important questions.