Not sure where abouts you are, but when I lived in western Mass, I frequently shot at
Westfield Sportsman's Club . Quite a few muzzleloader shooters there & a friendly bunch of guys.
As far as safety goes, given that it's a modern muzzleloader, there hopefully shouldn't be any issues.. Just check the exterior of the barrel for rot/holes/cracks, etc... Find yourself a bore light, or a very bright light that'll allow you to see down inside the barrel. Check for rust.
As far as cleaning goes, get yourself some black powder bore cleaner, bore butter & some cleaning patches.
Slide a cleaning patch on end of cleaning rod or ramrod with attachment, dip it in the bore cleaner. Stick the rod in the barrel & slide patch to bottom of barrel til it hits the breach & pull back out, slowly so that you're cleaning.
now remove patch & repeat this process until patch comes out clean.
Next, take a patch & rub it up with bore butter & coat the inside or barrel a couple time to lube it & protect it from future fowling as well as moisture/humidity/rust.
As far as loading, you'll need either black power or pyrodex pellets, as well as lead balls or sabbots & patches.. the patches are not same as those for cleaning, these are bullet patches.. use prelubed as it helps with cleaning, loading, etc....
For black powder, I usually go with elephant or Goex. You'll need a powder measure & a bullet starter too... slowly pour powder into your powder measure til it contains the amount of grains to match your caliber.. let's assume it's a .50, so on powder measure there's supposed to be a line to tell you where 50 grains is,, fill it to that line.. next, put that powder down the barrel... next step is the lead ball & patch. Put patch under ball & put ball at top of barrel.. patch first with ball on top of it.. (or sabbot).. it won't just goe in, you need to tap it with your bullet starter, once it's in the barrel, insert ramrod & ram it home. You are now charged.
Next, when ready to fire and ONLY WHEN READY TO FIRE, you will place a percussion cap on the nipple. Watch the hammer so that you do not accidentally fire.. KEEP YOUR FINGERS OFF TRIGGER AT ALL TIMES UNTIL READY TO FIRE. Once percussion cap is on nipple, you are ready to fire.
(Unless of course it's a flintlock, then that's a whole different method)
Aim down range, cock hammer & now you can fire.
Now take a cleaning patch with some bore cleaner & do a quick wipe after every single shot. At end of day, do a cleaning & re-lube..
As far as pyrodex goes, simplifies things a bit.. these are premeasured powder pellets in given calibers.. you just drop em in then do the patch & ball.
If western mass isn't too far, I'd reccomend Nicks Sporting Shop in Palmer, he has powder, balls, cleaning supplies, tools, everything you need & the staff are nice helpful folks & I'm sure they'll answer any questions you have.,
Muzzleloading is fun, isn't too difficult to learn & I'm more than certain you'll have it all down after trying your first couple rounds, although there's various methods depending on various things, but method I gave is the simplest.