I have to pump my clutch when I start my truck?

When I start my truck for the first time in the day, my clutch doesn't seem to work right… Or at all(although with the truck off I can switch gears fine). I have to pump the clutch pedal A LOT to even just get into first gear, but after a little bit of awkward/ hard gear switching and about 2 min of driving, everything works its self out and the truck runs normally. And every time I start the truck later in the day the clutch works fine. If I start the truck in first gear even with the clutch pressed all the way down, the truck will immediately move forward.

Remember that this only happens the first time start my truck in the day.

-My truck is a Standard Ford Ranger 94'
-I had to take the truck to Midas in January, and ended up getting everything tuned up so far as I know.
-The engine oil does seem a bit low, about 3 inches on the the dipstick.
-I checked the clutch fluid and it was low so I filled it.
-Brake fluid is also good

I also don't know much about mechanics.
What's wrong? Is it the clutch, and how do I fix it?

Leaking slave cylender. Get a kit for it cheaper than a rebuilt slave cyl.