Three month old male kitten, when should we neuter him and what to do about many fleas? Is flea collar okay?

I have a male kitten, and he's just about three months old. I believe he's a regular cat, a Short Hair American cat. 1. There's a huge debate on when to neuter him. Should we do it in four weeks, or when he's six months old? I heard six months is too late? Please EXPLAIN! 2. He has many fleas as... show more I have a male kitten, and he's just about three months old. I believe he's a regular cat, a Short Hair American cat.
1. There's a huge debate on when to neuter him. Should we do it in four weeks, or when he's six months old? I heard six months is too late? Please EXPLAIN!
2. He has many fleas as my dogs do. Is a flea collar alright for such a young kitten? If not, then why? What should I do to get rid of his fleas? I give him daily baths in flea and tick killer. What else?

4. Any tips/information on training my kitten? Any major areas I need to worry about and put extra work into?
3. Any other tips/information on a three month old kitten?
Update: Can give stories and list your favorite things about your kitten(s)/cat(s) if you want to(: Love reading it.
7 answers 7