What does the T14 mean. Explain the language please.
"T" notation is usually used in reference to level tungsten-coated tips. T14 means 14 grains per foot. T-11 is 11 grains per foot, T-17 is 17 grains per foot, etc. Such heavy tips are usually used in winter conditions and/or with large, heavy flies. By contrast a Rio
10ft type-3 sink tip, called "type 3" as it sinks around 3 inches per second, in 7wt is around 75 grains or 7.5 grains per foot.
T-14 is about as heavy as most people cast, quite a load for a beginner casting a 6/7 switch rod, and probably on the border of what your equipment is capable of. The above advice is reasonable, go to a floating tip as you learn, or, at least, a more manageable sink tip, e.g a Rio
MOW medium tip with 7.5 ft floating/2.5 ft sinking T-11.
Get on some water, get somebody to help you get started.