First time trying to socialize feral kitten

Hello, catsite!
We just trapped a feral kitten yesterday (we've been recently feeding the mother cat and she gave birth in our backyard). We trapped this kitten yesterday and let it stay in its cage for a hours but it soiled itself (we didnt have a litter box in the cage) so we had to let it out into a spare room. The first day it kept hiding in the corner and kept crying. I havent tried touching it yet (its hostile and keeps spitting/hissing at me even while i give it food) Right now its beginning to roam around the spare room and its ears perk up when it hears its mama outside meowing but still hides whenever I'm around. I wanna try touching it but I'm also scared it might bite/scratch me.

This is the first time I've tried to socialize a feral kitten before (I've also never had a pet cat before) so I'm a little clueless what to do. Do I just approach and pet it or wait until it comes around? I think the poor kitten is scared and just really misses its momma.

How old is the kitten?

Hello! I can't say for sure but basing on kitten progression pictures I saw online around 6 or 7 weeks.

He may still not be weaned from his mother is he eating wet food?

I would get some kitten milk and a good quality kitten canned food at PetSmart or Petco.  Make a slurry and place on low plate.  Put it on a vinyl tablecloth or shower curtain because he is going to be messy.

He is soiling himself because he hasn't learned to use the litterbox, which is one thing his mother would have taught him.  He will need to be cleaned up - another thing his mother would have done.

He may also still need to be stimulated.  Mom licks her kittens' behinds to get them to poop and pee.  If you notice he's not going, you will have to do this.  Otherwise, he'll get constipated.

He's small enough to force a little.  By that I mean, wrap him up in a nice warm towel, like a burrito, and cuddle him.  You can sing to him or just talk softly.  Stroke his head softly and let him know that holding him does not mean you will hurt him.  Do this for a few minutes a day until he feels comfortable.  Don't push it - if he gets stressed, gently put him down.

Spend as much time in the room as you can, talking or reading out loud.  He will get used to your presence and your voice.

When you get a litterbox, put it on a vinyl tablecloth or shower curtain.  And use NON-CLUMPING litter.  Very important as, like all babies, he may try to sample the litter.  Clumping litter will cause tummy troubles if he does.  You can start using clumping litter when he's a bit older.