Glad you are getting into the sport.
Right off the bat, I'd say you are in a primo flounder on the fly spot.
Looking at the charts thats what I thought. Couple of cuts from indian river to rehobeth bay looked perfect. Any fish getting in or out of rehobeth bay have to come thru them and the channel is close enough to the bars to cast into.
To much work trying to drift them and stay off the sand.
Here are some basic answers
1) For sinking line use no more than a 4' leader. You'll never feel the strike.
2) Stick to a 20lb dacron line for backing
3) 7wt is fine.. but.. I gotta say this.. if it wasn't meant for saltwater was that sucker out big time when you get home.
I think I'll try the floating line and leader.
20lb dacron it is.
Rod and reel have been around for 30 yrs. Bought them at sears. Not made for salt but good to start. Probably just found my next expensive hobby.
Now.. how to fish tidal cuts....
At 3 to 4 feet deep a 250 line will get hung mercilessly. A floating line with an 8ft leader will catch fish with impunity.
A 250 would be ideal for the inlet or any structure from 8 to 15 feet deep.
Repeat after me.. swing the fly... swing the fly.. I can out catch a bait fisherman under certain conditions with a fly rod. Why? Because I can make the fly move naturally in the water. No sinkers.. no lead heads.. just me and the fly.. You want to cast quartering upstream and allow the current to take the line. Keep in contact with the fly...the strike will come when the line straightens out.. 90 % of the time.
What flies did you buy??? Those will be important..
Have you ever had a casting lesson? That's important too..
Snap swivels are the devil... I think Cape May Ray uses a small snap on his flies.. but a normal swivel won't help your cause.