One of the myths associated with scroll sawing is that a person has to have a high dollar saw to be able to create a scrolled piece. You can create nice scroll sawed work from a low end saw--it's a good way to get involved in a very rewarding and satisfying form of woodworking that doesn't require a large investment in power machinery and tooling. Many people start out with a low dollar saw, and may eventually upgrade, according to their interest, and desires, to a higher quality saw.
That table will definetly clean up, and you can make nice fretwork pieces on the saw. I can't tell from the picture, but will the saw accept plain end blades, or does it use only pin end blades? Pin end blades require a much larger access hole when doing interior cuts in a fretwork pattern, thus limiting finer detail work, while plain end blades use a very small access hole. That needs to be taken into account when selecting a pattern for the item you wish to make. I bought a Craftsman scroll saw many years ago that took the pin end blades. I made a clock of my own design that resembled an antique one cylinder engine with the cast iron flywheels, and was quite happy with the result. I had no knowledge of blade types or patterns available at that time, I just wanted to make wooden pieces that were best cut on a scroll saw.
The table is cast iron on your Delta saw. I would use a sanding block to sand off the rust, then use a product such as TOP SAVER, or something similar. That an be applied and scoured into the top with a 3M scour pad, then when dry, buffed off with a cloth. You can also use Johnson's Paste Wax. You want the table to be smooth and friction free.
Good luck, and happy sawdusting!
There are quite a few scrollers on the forum who will be happy to lend advice, and help--just give a shout.