For scuds if they are tiny, it is almost impossible to get any weight on the hooks without filling the gap. With the tiny scuds in the #24s use some #6 split shot about 12" up the tippet from your scud. I weight my bigger scuds in #16 and #10s. I think the key is to keep them on the bottom.
An indicator can be a big dry fly, you never know when a trout may decide on the surface for a meal. Anything for an indicator will work. If you can watch the tip of your fly line and see it, you can get by without an indicator. When you have a slight pause, that's when you probably have a strike. With the ripples and the small size of your fly line, a pause may be hard to see. There are indicators that just have a toothpick to wedge the tippet in place, bright colored foam adhesive that pinches on, tons of options. To rig it, just have enough tippet out to keep your fly on the bottom. You need to put the food source where the trout are looking and expect to find it.
You can catch trout on about anything and I have thrown it all at them. The previously mentioned patterns always produce. If those are working try something that starts getting some hits. I would just try to find what color and size they are looking for in the eggs, worms, scuds, sow bugs, midge and sculpin patterns.
For scuds I have tan, brown, olive, black, white and yellow. Probably any color would work with the right presentation.