You can find LOTS of information online about when to vaccinate your kitten!
Here’s what we recommend at Pro Pet Fix
The first visit your kitten will get FVRCP vaccine (for upper respiratory viruses) + Deworming + Combo test for FeLV and FIV
The second visit should be 3 weeks after the first. Your kitten should have an FVRCP booster + 2nd Deworming + FeLV (Feline Leukemia) vaccine
At 4 months your kitten is ready for their FeLV booster and Rabies vaccine