This Morning I was getting ready to go to work.

This morning I was getting ready to go to work went outside and my truck would not start. The lights, radio and everything else came on it just wouldnt crank when I hit the switch. When you turned the switch it was dead silence, no noises or anything. I kept trying to crank it over and over again for about 10 mins but nothing(mind you its verrrrry cold outside) so I go back inside and wait for about 10-12 mins went bk outside and tried to crank it again and it didnt so I tried a second time and IT CRANKED! So I came bk in and waited another 10 mins went and tried it again and it cranked. Came inside and started googling problems for 2001 ford expedition 5.4L and found this website, didnt know the exact milage on my truck so I had to go bk outside and get it, thinking oh what the hell so I tried to crank it again and it cranked. But I just want to know what could be wrong with it? I have two kids and I also work hard everyday and I need my vehicle. Please help.