MCV: Mean corpuscular volume (MCV) is a measurement of the average size of your red blood cells (RBC).
MCH: Mean corpuscular hemoglobin (MCH) is a calculation of the amount of oxygen-carrying hemoglobin inside your RBCs. Since macrocytic RBCs are larger than either normal or microcytic RBCs, they would also tend to have higher MCH values.
RDW: Red cell distribution width (RDW) is a calculation of the variation in the size of your RBCs.
Monos/Lymphs: White blood cell differential looks at the types of white blood cells present. There are five different types of white blood cells, each with its own function in protecting us from infection. The differential classifies a person's white blood cells into each type: neutrophils (also known as segs, PMNs, grans), lymphocytes, monocytes, eosinophils, and basophils.
Here's a bit of information on each of those tests that you asked about. Like I said in my PM Becky, they are all part of the Complete Blood Count, and they are all routine tests run on everybody. I don't think I'd worry too much, but if you are, be sure to ask your Dr.