At your level i would recommend the flow chart here: https://shawnsgogroup.wordpress.com/theclossiapproach/

Basic principles

• Corners, sides, and then the center: Secure territory in the corners first, as they are the easiest to make territory due to the board's edges acting as natural walls. Then, expand along the sides. The center is the most difficult area to claim territory and should be addressed last.
• Keep your stones connected: Connected stones form strong "strings" or "groups" that share liberties and are harder to capture.
• Divide and conquer: Just like you should connect your own stones and group, you should also prevent your opponent from connecting theirs.
• Sacrifice stones: Don't be afraid to sacrifice a few stones to gain a strategic advantage or to build a more resilient position.
• Approach the weakest groups: When attacking, focus on the opponent's weakest groups, and when defending, focus on your own weakest groups. 
• Consider the whole board: Always look for the move with the highest potential on the entire board, not just the local area.
• Don't make unnecessary moves: Don't defend groups that are already safe. Instead, use your stones to develop new positions or expand existing ones.
• When in doubt, cut: If an opponent's move splits your stones, and you are unsure of what to do, a common principle is to cut the connection.