Here's the beginning of my fantasy tell me what you think?

“I must see him!” Isaac gasped. “He must know!” He ran through the forest, smothered by the fog. Briars whipped the young man’s legs. He ran straight towards his goal, ignoring the pain of briars and thorns piercing through his skin. After running for about half a mile or so, he finally came to the edge of the thick forest. Across the valley was the castle. Its marble turrets gleamed alabaster bright atop the grassy mountain.
Isaac knelt on the muddy ground, panting hoarsely. A moment passed before he found the breath he needed to run across the valley, toward the town. The town had various cottages and many towns’ people chatting amongst themselves. The roads were narrow and made of large rocks. Isaac swiftly maneuvered himself through the crowds only brushing against one person, Sir Larry. Larry is the chief guard of road surveillance. His job isn’t much but watching over the citizen making sure everyone is safe on the road. But he takes his job very seriously, just a little too seriously. “I say, did you know you’re in violation of road code 5079?” Larry said. “No horse playing in the road. I might have to take you in.” “I’m sorry I must be going.” Isaac said running off. “Get back here! Guards get that boy!” Larry yelled. Isaac ran past the moving fruit carts slightly bumping them. He continued to run while looking behind him making sure that the guards weren’t to close behind. “Halt in the name of the law!” said the guard as he tried to push through the crowd of people. Isaac continued to run as he came to this empty dark alley. “Halt!” repeated the guard. Isaac's heartbeats were erratic punches in his chest as he stopped to haul in a breath. Isaac swiftly hid behind an abandoned cart hearing the metal of the guards clank as they ran by. “Whew!” Isaac whispered. He was so happy that he was not being chased anymore that he almost forgot why he was running.
He then snuck up to the edge of the corner to make sure the guards were no where around. He then swiftly paced into the street heading toward the narrow bridge that leads to the castle. The bridge is made of gray cinderblock and has moss growing on the sides. As he continues to walk he continues to admire the beauty of the land surrounding the castle. The plains were luscious and green, with exotic yellow and red flowers flowing in the breezes. The moat circling the castle had pure blue water, which glistened in the light like a thousand diamonds. The castle itself was a masterpiece of beauty, with tall walls made of pure white marble and engraved with jewels. It stood at such a great height, that its peak pierced the clouds. However, he soon noticed that he was just a few feet from the lofty brown doors of the castle and the fact that no one has ever entered the castle uninvited and lived rang through his mind. “I just might die if I do this.” Isaac said in fear. He then slowly reached his hand toward the large rusted ring of the castle door and slightly tugged it. When he peek his head into the crack of the door the vast entrance hall of the castle to his surprise was unprotected. He opened the door slowly and entered. His fear was wiped away by the beauty of the entrance hall. The tiles of the floor were purple and the walls had a gold color. The ceiling was high and had a heroic painting of the king standing over a fallen enemy. This picture brought hope to Isaac’s heart. Still curiously looking around he saw that the only things that light the hall was the fire torches that hung against the gold colored columns.
Isaac then continued to tip toe his way down the hall until he heard what sounded like a quiet chatter. He slowly turned his head to see who was in the hall. It was the royal guards. “I say did you here about what happened in town today?” said one of the guards. “Yes I did. Seems like some young lad gave Larry a hard time.” replied the other guard. “Oh, no” Isaac whispered. Isaac turned his head again to look at the guards. However, behind the guards he saw that through the glass circle at the top of the door was a man sitting on a throne. “That must be him. That has to be the throne room.” Isaac said. But in order to get to the king he must find some way to distract the guards. He dug his hand in his pocket remembering that he had a coin that he had gotten for helping his dad with his sheep this morning. So he then threw his coin down the hall praying that it would distract the guards.
The ting of the coin dropping on the floor echoed in the empty hall. “What was that?” said one of the guards. “I don’t know lets go check it out.” replied the other. As they ran to check to see what made that noise Isaac busted through the throne room doors. “Sire!” yelled Isaac. Isaac's yell cut through the stillness, and from the corner of his eye he saw the guards whirl around and spot him. “Halt!” yelled the guards. Isaac ran into the throne room saying “I have something to tell you. It is of great urgency!” The guards ran up behind Isaac and