Novice needs advice on a ocean Rod/Reel

I'm overwhelmed by what I'm reading.

I got a 21' SeaRay and have rods for bay fishing. But, I'd like to get
a good rod/real for the ocean. I'll be fishing in waters off Rehoboth
Beach, Delaware in about 50' depth.

Since I'm new I don't really even know what to ask so please feel free
to give me whatever advice you think I'd need.

Specifically:

What is a good length rod? Shorter makes sense since the boat isn't
that big.

What type of reel?

What is the right weight sinker? Do I let it go all the way to the
bottom? (I'm telling you I'm a novice!)

What is a good bait to use? Are lures good?

Should I invest a lot of money now or just get a mediocre rod/reel?

What is a good brand/model?

So far I've been catching rays and small sharks and let them go because
they were all too small.

Thanks a bunch for any advice.