Photoshop and a good eye-sight. Then be observant sa surroundings mo. Tapos try to search for digital coloring tutorials here. I have a few tutorials that might help you. Just check my gallery. Good luck!
okay...ill do that...and yung mga drawings?mag draw muna ko sa paper tapos scan ko then transfer sa photoshop?ganun?meron ka ba pde bigay saken na pde ko pag practisan ng colors?then pakita ko sau and you can tell me what you think?