Confused on Electrical Hookup

[Iwannarelax]

Hello,
I have a Silverton 41, 1995. It has one 50amp 125/240V and one 30amp hookup. I am needing a 220/240V outlet for a mini-split ac unit.
I've been reading that if I have 50amp, I already have 240 to the boat. But, what is needed to get that to an outlet? My breaker panel doesn't show 240V only 2 batteries and two for 120V. So, would I have to have an electrician come aboard and wire a 240V to an outlet and a breaker to handle it and that's it?

Thanks in advance. Still not sure why there is 30amp.