Your best source of information on that question is to talk to your lender. Lenders/mortgage bankers are the ones who charge you closing costs for closing your home purchase loan. You can negotiate with the seller to give to you a lump sum of cash back at closing for you to use toward your total closing costs number, but the actual amount of the closing costs - fees, points, amount of pre-paids required, amount of items required to be escrowed such as taxes, etc. - are part of the deal you strike with your lender. If you need recommendations for a lender, I will be glad to provise those to you.
In addition, if you are interested in buying a property and want an agent to work with you on that, I will be glad to do that, too.
Good luck to you.
Besides that all other cost are paid by the sellers at this time. The rule of thumb, depending on the lender and your credit status, closing cost can range from 3% to 4% of the purchase price. I set it up during the offer phase, to get as much as possible and if there is extra, my client's will have the option to use it towards debt, like credit cards, car payment, loans etc.
The is usually the same with an FHA loan, however you do have to put 3.5% down towards the loan, so $3,500 per $100,000 barrowed.
Get with me and I can set you up with everyone you would need during the home buying process. Thanks for the question and I hope this helps.