Welcome to the forum!
Do a search for "suspension" or "handling" and you will find much discussion about that here. Before you spend anything on modifications, get that alignment that was recommended. Some here have added sway bars, steering stablilizers, springs and shocks.
We found that alignment and shocks made our Vegas drive great. Your results will vary...
Only some of us learn by other people's mistakes, the rest have to be the other people!