Thanks for the addition Erick, I completely agree. Earlier, I wasn't trying to say that you can't be a wholesaler if have a full time job. I was simply noting that many investors are more than willing to pay a small markup in price for the convenience of a wholesalers services because they already have a full-time job and there just is not enough hours in a day or week to spend looking at properties when they have family obligations as well.
You can be a very effective wholesaler if you just want to work in your spare time around your work schedule, but it will take a larger time committment than just driving around and finding prospective houses. Investors generally want other information such as: Estimated After Repair Value (Estimated Appraisal), Renovation Expense, Taxes, etc. All of these things will require you to meet some people that can assist in your estimations. I have an appraiser that will get me comparable sales and the range that he feels the house will appraise in. You should also know the prices for specialty repairs (HV/AC units, flooring, etc.). Many of these vendors will be at the local REIA meeting and can give you a rough estimate based on sq footage.
Hope that helped!