Beginner needs some help!

check out the helpfile for the "filtercoeff~" object(try a 'gain' of "0.8" and a 'q' of "2." to start with for the 2 parameters there), you could choose "bandpass" from the mode-menu there, and instead of the cycle~ object going into the frequency input, you can just use the vertical-position outlet of 'mousestate'(except you'll need to scale for the vertical resolution of your screen by dividing by the maximum - if your screen's resolution goes up to 900. for example, you divide the mouse-state outlet by 900., this gets you the range of 0. to 1., then send the rest(via [sig~]) into the multiply-by-400 in that patch).
from there, you just need to tune the range and the center-freq: the multiply by 400 gives you a range of frequencies up-and-down within 400Hz, while the [+~ 1500] object sets the minimum freq around 1500Hz(allowing you to sweep between 1500Hz and 1900Hz: a 400Hz range starting from 1500; i'd try 4000 instead of 400, and 150 instead of 1500 to sweep between 150Hz and 4150Hz).
two last things, is that you'll need the 'sig~' object to turn the mousestate's floating-point output into signal, which can then be fed into the rest of the helpfile patch there, but it's best to do the divide by 900(or whatever your vertical resolution is) outside of the signal realm.... and also, the bottom of the screen is usually the higher value, so you'll need to invert things after the divide by subtracting everything from 1(use a [!- 1.] object for this).
so it might look something like this, all can be tested from within that "filtercoeff~" helpfile:
[mousestate] -> [/ 900.] -> [!- 1.] -> [sig~] -> [*~ 4000] -> [+~ 150] -> [filtercoeff~ left/frequency-inlet] -> the rest is same as the "filtercoeff~" helpfile from there.

for the coloring part of your question, you can basically just connect the coloring to mousestate since mousestate controls the frequencies(as an example the output from [/ 900.] could go to "red" value, while [/ 900.] -> [!- 1.] could go to "green" value, this would raise one by lowering the other in tandem(that might give you a mix of coloring in the middle which might not be what you want...)... but if you try it in patch form first, upload here if you have troubles and someone can help you further more easily)

for more information on filtering, there are tutorials here under the "Filters and Subtractive..." section:
https://docs.cycling74.com/max8/tutorials/00_mspindex

but Tim's video tutorials are also pretty inspiring:
https://cycling74.com/articles/a-tour-of-filtering-tools-in-max/
https://cycling74.com/tutorials/demystifying-filters-video-tutorial/
https://cycling74.com/tutorials/crossover-filter-design-video-tutorial

hope that helps get ya started 🍻