Being as you are just starting out, I would not want to see you saddle yourself with the absolute pure hassle of needlessly trimming away flashing.
Being as you are willing to purchase multiple molds, I would suggest doing just that. Buy molds that will work as designed and then start. Maybe two for salmon and two for crappie. There are so many other aspects to making jigs that you will want to waste your time on that are much more enjoyable than trimming flashing.
It is easy enough to spend a half an hour making just one completed jig. Pouring, trimming, filing, painting, adding eyes, and then hand tying. So you will be wanting to have some fun as you go, or else you will just store everything in the garage in a box marked- MISADVENTURE #37.
I find the process to be much like a hobby and I definitely enjoy creating ridiculous little lures for stupid little fish. In fact, I tend to make rather odd lures and then run around the local lakes catching fish with them. I always get nervous when the local men get close to my boat and start viewing the jigs hanging of my rods. LOL. Also, I am forever fining new things that I need to order so that I can experiment further, and have a nice little collection started. Storage becomes a bigger and bigger issue as I go. Soon my wife may have me in a box in the garage marked misadventure.
Here are a couple of pictures to try to push you over the edge and trick you into thinking that you too want to catch fish on lures that you made. I made this lure, named it the Whirling Dervish and then caught some fish with it. Nice 14” fish in the picture.
Good luck and check out the jig making forum here. Lots of folks with experience and talent. They helped me more than they should have as now I am a lure delinquent.