Yes, it is possible to cascade a LP and HP filter to form a bandpass. If the fractional bandwidth of the filter is large, then a cascaded HP & LP is a good choice, e.g., HP at 1 MHz, LP at 100 MHz.
If the fractional bandwidth is smaller, I would look for a different solution.
At 1 GHz, it's possible to use air core inductors and chip capacitors, but it's on the cusp of a strip line design being a better choice.
Frankly, as a first experiment in building filters, I would look for a simpler design at a lower frequency. Why not start with something as simple such as a 2 MHz high pass filter to roll off AM broadcast band (medium wave) signals.
And, mHz = milli-Hz, i.e., 0.001 Hz -- there are some programs that are picky about capitalization, MHz = mega-Hz, i.e., 1,000,000 Hz. (commas are thousands separators). LTspice will get you every time with this, MHz is read as milli-Hz; for megaHz, you need to use meg. There may be others as well.