you dont want just any house. it needs to be a house that you can get at a good discount for someone who fixes them and resells them (there are different ways to wholesale but we'll stick to this one).
find a real run down house, or someone who is really motivated to sell their house. you need to get it at a humungo discount which is why real rundown houses are usually good targets.
figure out what the home is going to resell for when it would be all fixed up. agents run comps using mls, or you can use it as a starting point using zillow (DONT USE ZESTIMATE.)
figure out all the costs associated with buying and selling a home. property taxes, insurance, utilities, transfer tax, brokers commission....
make an appointment with the seller to go check out their home. figure out all the repairs that need to be done to the home.
Home resale all fixed up - all the holding and closing costs - repairs - profit = max offer
As a beginner, i would find a guy who fixes homes and resells them so you can learn from him. you'll have to trust him because you are unlikely to get the property under contract, it will probably be more of a trust game with him where he will give you commission as a finders fee.
find some homes, tell your buyer to come check it out with you and then he will tell you where to go from there.
