Hi all, I am new in this hobby (actually not into it yet

). I plan to get some drosera and vtf soon and I got a few questions here before I wet my hand on this

.
First, the media for cp, most of the info I found on the internet say mixture of peat moss/sphagnum moss with sand/perlite, but how actually I need to mix them? Just mix it directly or divide them layer by layer like putting media in a canister filter? Sorry, I know this question is stupid but I really never see a live cp before, I'd visited a few nursery here but no luck.
Compare peat moss and sphagnum moss, which 1 is better?
How long do I need to change the media?
Thanks.