recommended plugins for scarlett solo and mac

[maddis]

I'm planning on using a scarlett solo 3rd gen.  I'm looking for basic electric effects (reverb, compression, some overdrive, tremolo) and a decent compression and reverb for vocals.  Here's the kicker - I'm not particularly computer savvy - I'm not even sure I entirely understand what a plugin is!  Or where I should put it.   .  But I'm so psyched to try this!