Spot on Superfly! Maxima with it's high abrasion resistant qualities and good knot strength is definitely the line of choice for saltwater leaders.
Strike indicators are generally not used in the salt.
As for the fish you intend targetting, we could basically split the fish into two categories, i.e. bottom feeders and top feeders, with Grunter and Cob falling into the bottom feeding category with Leeries and Skippies more on the top or just sub surface.
Grunter are probably the most frustrating species that one could hope to target, and a lot of thought needs to be put into presentation of the fly. MC Coetzer has had a lot of success with his Jam fly, which is a shrimp like immitation, but the secret of the fly's success is in the way it 'sits' on the bottom. One needs to play around with bouyancy in the construction of the fly, the end result of which is a fly with neutral density, one that is dense enough to go down, but will still sit and scoot upright on the bottom, no matter what. As MC has proven, it pays to experiment a lot in this regard. Tank test your flies first until you hit the right formula. These flies will be fished on a dead slow crawl with the odd strip to jetisan the fly backwards, much like a prawn would do if it should flick it's tail
For Cob, large streamer patterns are the way to go. What you need to immitate is a fleeing baitfish, so eratic strip retrieving is the way to go.
For Skippies and Leeries, poppers (preferably white) on the surface attract lots of interest. Try to make as much commotion on the surface with different speed strip retrieves. The commotion caused on the surface by your popper is great for blind fishing, because it is sure to attract fish from nearby. Once they lock onto the sound, what they then see is a fleeing wounded baitfish on the surface, and they simply cannot resist that! I have had on occassion 4 Leeries fighting over each other in pursuit of my popper. This has to be the most exciting way to take a Leerie.
If you are sight fishing to swirls and scattering baitfish, you could also try going sub surface and a very good fly of choice will be something like a Clouser which gets down quickly. A fast strip retrieve should be commenced immediately after the fly hits the surface to ensure that you dont land up dredging in weed from the bottom. Chartreuse works particularly well.
Casting is something that most salt water fly fisherman become extremely efficient at. The guy who has the ability to cover a lot of water is the guy who is going to be getting into more fish by the end of the day. Invariably one has wind to contend with at the coast, so one needs to become proficiant at the double haul to increase line speed during false casting coupled with the ability to cast a tight loop that will cut through the wind to give you the desired distance. For the beginner, I would suggest that you experiment by aerializing a short line firstly. Concentrate on the 11 o'clock back and 1 o'clock forward casting stroke. Let the rod do the work, and try not to force the cast too much. Feel the weight of the line tugging at either end as it reaches the end of its travel. Once you are comfortable with that, with your stripping hand, give a short 6 inch tug on your line as you commence each of the forward and back strokes. Once you have mastered this, try shooting line out back and forward a split second later.
In this case, it is a matter of easier done than said
It is really not easy to explain, and if you don't come right, rather approach a pro and ask him to demonstrate the principal to you. The rest will be upto you. Practice, practice and more practice makes perfect!
I hope this long winded post helps
