How long has it stood idle, is the first question to ask. Springers can lay dormant for a year+, easy, but there's a limit to the lubes' and seal materials' longevity. Here at GTA the default is to assume the gun has been kept indoors, out of the elements, and out of wild temperature and humidity swings. In the larger sphere of things, this is NOT the default, I've learned. An unoiled springer left in a leaky barn for a few seasons would go bad in several ways.A springer with just 100 rounds through it is still ways off being broken in, as I'm sure you know.
Has it been lubed? The later ones came pretty dry.
If you've never cleaned the barrel I'd start there. I usually start with a dry patch to get the worst of the manufacturing crud then follow with a patch dampened with Ballistol or Hoppe's Number Nine. After that run several dry patches as the residue will detonate. You should put a drop of oil on the barrel pivot and lube the latch ball as well for smoother cocking. The later guns tended to have the pivot screw too tight making them unnecessarily hard to cock. You are allowed to loosen the pivot screw a bit if this is the case. If you wish you may remove the stock and put a bit of moly lube on the exposed spring. That will smooth its operation and cocking and shooting will throw the lube all around in there. If you have no moly lube even a bit of grease will do. Beyond this stuff you'll have to disassemble the gun and a spring compressor and dummy pins are advised for that. Beyond this if you're worried about breaking in the barrel you can shoot ten pellets then run a dry patch through the barrel. Repeat the process ten or twenty times. Enjoy.
Don’t get ahead of yourself. Shoot it and see what it tells you it needs. Probably nothing but a few dozen pellets thru it.
...Is there a diy spring compression I can make or even a make shift way of compressing that spring?