Okay, so here we have what seems like a very daunting list of chemical reactions to remember that don't seem to make any sense! But don't worry, with practice you will soon grasp the concept quickly.
Location
The first thing you need to remember is where this reaction takes place. This reaction takes place within a fluid known as the stroma in a structure called a chloroplast inside a leaf.
Stages of Reaction
1) All plants need CO2 for photosynthesis. This is our first step. CO2 enters the leaf through the stomata and diffuses into our liquid stroma.
2) Next, this CO2 is combined with a 5-carbon compound called ribulose biphosphate (RUBP) forming an unstable 6 carbon compound. This is catalysed by an enzyme called rubsico.
3) Since it is unstable, this 6 carbon compound quickly breaks down into two molecules of a 3-carbon compound called glycerate-3-phosphate.
4) ATP and reduced NADP (from the light-dependent reaction) then reduce our glycerate-3-phosphate into a different 3-carbon compound called triose phosphate. (TP)
5) This is the product we've been after. Two things can then happen once we have TP: it can either be used to produce hexose (six carbon) sugars such as glucose, or go back into the cycle to regenerate RUBP so that more CO2 can combine with it and the cycle can begin anew.
So in summary:
1) CO2 enters stomata and diffuses into stroma.
2) CO2 + RUBP = unstable 6-C compound
3) 6-C breaks into x2 of G-3-P
4) ATP + Reduced NADP then reduce G-3-P into TP
5) TP either makes useful substances such as glucose or regenerates RUBP.
Any more questions, feel free to drop a message.