Color, I have hear people using slightly watered down acrylic paints to color sails. It might be better to color the whole sail than try to pattern. If you know a good artist, then a permanent marker pen can add patterns. From my own experience black is fairly UV resistant, blue not bad, red will disappear in a a season, after first fading to pink.
Burgees will not help much. Burgees and tell tails are useful if you are on the boat, but you won't be.
Look at how full the sails are. If they are full let them out a little until the start to loose fullness. If they start to flutter at the edges, draw them in a little.
Have a look at points of sail stuff, and use this as a guide, although the wind over the boat may be at different angles to the wind past you on the shore. Especially if you are sailing near buildings, or hills. In the diagram, for points of sail, you will see when running the sails are on opposite sides. The boat will tend to do this on its own without your help. You don't need to worry about special RC control for this.
The other thing is basic sails set up. Once you have a grip of the basics you can download stuff on fine tuning, but the basics are:
Allow a slight belly in the sail. Not too tight on the boom not too loose, but you need a slight belly.
Make sure your sails are set so that when fully pulled in, they are not on the centre line of the boat. The jib can be about 10-15 degrees, and the main about 5-1010 degrees off centre.. This creates an aerodynamic slot that helps pull the boat forward.
Try this setup first, and then learn the theory later. See pic. The rest is just practice.