I am confuse about my starter, Please Help

[oldsmobilekindofguy]

Okay, I have a targetmaster 350 cast number 1006638, I am connecting it to a SM465 transmission, I went to the local parts store today to get a starter for it, I know starters are different for manual transmissions, but don't all starters come with a solenoid no matter what, I always though that was the case but he asked if I needed a solwnoid also so I said yes but do I need it?
I am confused I have never bought a starter for a manual transmission so I wasn't expecting this.

If the solenoid is separate, where does it mount?

I feel like an idiot not knowing this but whatever.