|Regarding setting the monitor itself and setting the right resolution in Windows....|
See Response 5 in this:
The buttons and what they do on CRT monitors vary.
If you bought it new it probably came with a printed manual, and/or there may be a manual on a CD that came with it.
If you don't have that, if you tell us which Sceptre model you have, we may be able to find you directions. That's usually on a label on the back of the monitor.
Generically, there's a button you press to pop up the OSD (On Screen Display) menu, a button or two you use to toggle which setting you're adjusting, and a button or two buttons for adjusting the setting greater or lesser.
Any monitor will last longer if you set the brightness to the minimum level where you can see everything you need to see.
If you play games, sometimes the default brightness in the game is too dark or too bright - the brightness can almost always be set in the game settings - in that case you don't need to set the brightness for everything on the monitor itself so that the game display is the way you want it.
"....set refresh to 70hz. "
That's the vertical refresh rate. It has nothing to do with the size of the image on the screen. The higher that can be set, the better moving video looks. How high you can set that depends on what the particular monitor model is capable of. Some of the later CRT monitors are capable of a much higher setting than for any LCD monitor.
If you tell us your specific model, we can probably tell you what the maximum setting for your model is.
You set that in Control Panel - Display Properties - Advanced - Monitor.
The montor must be Plug And Play Monitor or the specific Spectre drivers for your monitor model in order for you to be able to select higher refresh rates. If it's set tp Plug And Play Monitor, don't select the highest setting unlessyou have confirmed your monitor model can handle that, because if you do get a display when you set it to that, the monitor can be DAMAGED if it's set higher than the monitor was designed to handle.