Is there a connecting kit with springs and pins I need to connect the two?
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No connecting kit needed. AR-15 uppers & lowers are made to fit together, easily swapping between rifles.
...if I buy a complete upper, and complete lower, will it form to make a shootable gun?
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In most cases, yes.
Colt's use a slightly different connecting method, so Colt's uppers and Colt's lowers are not immediatly interchangable with others. These parts are usually identified.
If you get a standard upper and a standard lower, they fit together with two push-pins. These push-pins stay with the lower.
Do I have to worry about "the ban"?
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There is no Federal ban in place. It expired and is gone.
If PA has any bans like CA and NY enacted, then you have to worry about these state laws.
...it can be cheaper than buying a complete rifle
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There is
usually little financial advantage in building your own, especially if you are assembling only one or two. Cost of tools and parts will usually top the purchase cost of a complete rifle.
Oh yea... Welcome!