Conventions of a sci-fi and horror films

I want my film to be mainly sci-fi but with horror elements in it, so I had a look at a book called "101 sci-fi movies you must see before you die"and the horror version, so my film would have a sci-fi and horror feel and look to it. 

Famous sci-fi films

Star Wars, Repo Man, Terminator, Aliens, Predator, Back To The Future, Signs, 2001: A Space Odyssey, The Thing, Escape from new york, Jurassic Park, E.T, Fantastic Voyage and Transformers.

Conventions 

Location

In a isolated place 

On a space ship
On a different planet
In a City
On a Island
In a small town

Character
Usually the main character is ether a young boy like in E.T or an older man. It is rare that that they have a women as the main character in sci-fi films.

Plot
Most sci-fi films are about aliens trying to take our planet/killing us all. There are some films where the main character befriends the alien and helps them in some way, mostly to get them back home.

Props

Alien body parts/full suit, weapons, space ship sets, new technology, alien plants and rock.

Famous horror films 

Psycho, The Shining, The Exorcist, Rosemary's Baby, Frankenstein, Dawn of the daed, Halloween, The Birds and Evil Dead.  

Location

House, woods, castle, graveyard, school, a isolated place and a small town. 

Character

Usually in horror film they is a group of main characters like in Scream. 

Plot

Ghosts, the Devil, Murders, Zombies or Monsters try to kill off the main characters. 

Props

Fake blood, candles, dead bodies and Monster suit.