Pick a room that is large enough for the players to move around comfortably while they are looking for clues and working together. Also, make sure your props and clues will be able to fit. To make your game longer and more difficult, use two or more rooms that are next to each other and have guests "unlock" the doors between them as they progress through the game. Choosing an interesting setting will help you come up with themed challenges. It will also make it easier for the escape room to feel like a complete experience. You could choose to place the room in Italy during the Renaissance or in New York during the roaring 1920s. If you want to have even more control over the setting, choose a time in the future where the possibilities are limitless! Think of a theme your guests would be interested and intrigued by. For instance try to pick a theme that resembles a book or movie the group already likes. Make sure you will able to purchase and find props and decorations that fit the theme you choose. For example, if the setting is based in England during the late 1800s, use a Sherlock Holmes theme. If your guests like horror movies and Halloween, choose a zombie or haunted house theme. You could also create a prison escape theme in almost any time-period you like! Aiming for 30 minutes will help keep you from being too overwhelmed or having to come up with too many challenges. This way, you can focus on making high-quality puzzles and keep your guests entertained throughout. If you have made several escape room, and your guests have completed a few in the past, lengthening the time past 30 minutes will give your guests the challenge they need to stay interested.
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One-sentence summary -- Choose a room in your home in which to hold the game. Choose an interesting setting for the room to add to the story. Pick a theme that fits the setting. Set a 30 minute time limit if this is your first escape room.

Squash is a game played with two players (although you can practice on your own). The game begins when one player serves the ball from the serving square. The server hits the ball against the far wall of the squash court so that it bounces back into the other half of the court, opposite the servers square. The goal for both players is to return the ball to the far wall, only allowing one bounce on the floor before hitting it. When returning the ball to the far wall, it can bounce off the the side walls of the court, but not the floor. The last person to successfully hit the wall during a volley wins a point. You must hit the far wall of the court in between an upper line and a lower line, indicated on the wall. The bottom line has a strip of tin along it, so that you can hear when a ball hits it. A squash match is awarded to the player who wins the best of 3 or 5 games. Each game goes to 11 points, with the first player to reach 11, by at least two points, winning. If a player reaches 11 points but the other player has 10 points, for instance, then the game continues until one player gets ahead by two points. Unlike in tennis, either player can gain a point on any play. All that matters is that the person who does not return the volley loses the point. The player that earns each point follows their point by becoming, or continuing to be, the server. Position your hand so that there is a "v" between your thumb and pointer finger, but put the rest of the fingers close to the pointer finger. Grip your hand around the handle of the racket firmly but not so hard that your hand is stressed.
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One-sentence summary --
Review the rules of the game. Review how to score a game. Learn how to hold the racket correctly.