need more help
 

I just bought my first ford 2 years ago and just started having problems 3 weeks ago. I have a 97 f-150 4x4 and I love it but i need some help
1.started leaking oil from around the front drivreside tire
2.the trans seems to be slipping from 4th to 5th
3.the S.O.F switch just stopped working i turn the switch on but nothing happens.I'm not dogging this truck i was just wondering whats wrong and can i fix them myself