Your major problem lies in the question "Anyone knows how much that will cost?"
You should be able to determine that fairly closely, but that'll vary by property. Here are some thoughts:
Commissions Paid to Find Tenants
Fully negotiable, but figure the equivalent of 1 month's rent.
Maintenance, Cleaning & Repair
Really varies. Long-term, figure about 1.5% of the home's value per year.
Cleaning (between new & old tenants)
A commercial service may charge about $300-$450.
That's open-ended. If it's just minor ongoing items, that can be included under "maintenance, cleaning," above. If you're talking about initial landscaping, it obviously depends on what's needed. Maybe $4,000-$6,000, very roughly.
Advertising Costs to Find Tenants
Zero, if you're using a Realtor. That'd be included under "Commissions Paid to Find Tenants."
Tenant Screening & Background Checks
Zero, if you're using a Realtor. Otherwise, $25-$50.
Legal & Accounting Fees
Depends. If you're not having problems with your tenants, legal could well be zero. Accounting depends on whether you're using the accountant to do other work for you, too. An accountant could give you better figures, but perhaps $300-$1,000.
Hope that helps.