Welcome. A few things I would do is get a DVD or 2 from a reputable caller. The Randy Anderson DVD's are good. In the DVD you will learn tips & hear how the sounds are supposed to sound, of course variations are normal.
The book, 'Predator Hunting', by Gerry Blair is among the best in book form.
I'd get a mouth call or 2, Crit-R-Call 'Pee Wee'(or standard), & the Burnham Brothers 'Mini-Blaster' are 2 all time favorites.
I wouldn't get to hung up with scent spray & decoys. You MUST play & be aware or wind & breezes. Always be aware of which way you scent is blowing. I don't go overboard with scent sprays because I don't think it will matter enough, if the breeze is wrong. I setup with the wind in my favor.
For the most part here in the Eastern woods, when/if a coyote sees your decoy it's time for you to shoot. My experience anyway. If on a frozen lake or field edge it may be different.
We hardly call on the open unless it's at the 1st crack of dawn or at night. We are usually in thick cover with shotguns. That is where that coyote that left those tracks at 2 A.M. will want to be once it gets light.
Setting out a decoy can spread more scent, there you go too walking out in the open 20 yards or so. It's key to quietly get in position, sit, give it 3 minutes & start the set. You want no movement & no other noise. When that coyote shows up inside of 5 minutes you know he was very close as you set up.
The remote Foxpro is nice, have one myself, but there is a lot of HUNTING that goes into a successful setup. I like the Foxpro to get the sound away from me & also the variety of sounds. I still like to toot on a mouth call half the time though. An $800 caller won't make up for deficiencies elsewhere.
It's important to call at a spot that has a higher likelihood of holding a predator. That sounds simple & common sense but takes a little planning/scouting.
You can use any gun you have & a $12 mouth call & be on your way. Just some ramblings.