There is no recipe for merlot wine, it is grapes fermented...thats all.
How you ferment is the real issue. Start reading this forum tonight and read it until you figure out how you want your wine to come out. Even then, yours wont be exactly like anyone elses. Wine is an art that you need to learn.
Depending on the style of Merlot wine you would like to attempt, it all starts with the grapes or "must" you use.
You should research on this forum:
Crushing & destemming
Testing for Brix, PH & TA and methods for adjusting.
The use of the different sulfites
Temperatures for different stages, such as cold soak, fermentation and cold stabilization.
Punch down in primary fermentation and when to press.
Malolatic fermentation is some thing to check out if it applies to your situation.
if you like oak there are many ways to introduce it to your wine.
Settling, fining and filtering before bottling..