Everywhere. I'll take them one at a time.
A pardon is an admission of guilt
No, it is not. I don't know what hack site you got that off of, but it's entirely wrong.
A presidential pardon literally wipes the crime out. It doesn't exist anymore. It never, ever happened.
Here is article 72 of the U.S. Constitution that grants the president pardon abilities:
“The President shall have the power to grant pardons, reprieves, respites or remissions of punishment or to suspend, remit or commute the sentence of any person convicted of any offence: (a) in all cases where the punishment or sentence is by a Court Martial; (b) in all cases where the punishment or sentence is for an offence against any law relating to a matter to which the executive power of the Union extends; and (c) in all cases where the sentence is a sentence of death”.
That's it. Notice it doesn't say "but the guy is still guilty"?
Because he isn't. That's exactly what a pardon does: It completely obliterates the crime. It never happened. It no longer exists.
It also means the abrogation of the right to non self incrimination, no pleading the 5th
No, it does not. If you can still be incriminated in any way, you keep your 5th amendment rights. It takes a very, extremely limited scope for that to ever happen. In fact, it's only ever happened once in American history.
So no. You're wrong. Flat out.
Congress CAN subpoena Don jr, as many times as they wish and they don't need to send him a card, only the legal paper work.
Wrong.
Congress, like any body of law, has to have probable cause to use a subpoena. They can't just issue them like candy for no reason whatsoever.
The entire idea of getting Junior to testify against Trump is that Junior would be facing punishment for a crime. Now, that we know of, the only crime Junior is guilty of is lying to congress, a felony.
So if they charge him with lying to congress and lying to the FBI and President Trump pardons him for those crimes, that's it. It's over. They can't then subpoena Junior to testify about what Trump did because Junior was no doubt involved in it as well, which is self incriminating. He would then simply take the 5th. Forever.
That's how it works.
The only time you are not allowed to plead the 5th is when you can not in any way be implicated. Anything Junior testifies against his father about, he was also involved in, ergo, he can be implicated and thus be a witness against himself even if he hadn't been charged of that particular crime at the time.
It's you that needs to do a lot more reading. Or you could do what I did and get a degree in Criminal Justice. Then you'd understand a lot of this shit much better.