exact step by steps on what to do after your clients says "DEAL"

[Brandon McMullin]

I made business cards and went door knocking on houses that were going through pre foreclosure, one guy was interested in selling me his house, I did some research in the neighborhoods prices before I started, this guy would sell me his house for 40k, worth about 90k after only 5k of repairs since im a handyman and can do a lot myself.

after I left his house after the deal was made, I was unsure of the next steps I have to go through to buy the house, do I contact a realtor now and tell him I want to buy this house and the owner agreed to this much? or can I do it without a realtor to avoid fee's 

do I just go to the title agency? help! just got the deal a couple hours ago

Im a newbie but trying to learn as I go so here I am lol