One of those things would be to form some type of entity that will protect you personally from filing or a judgement you might have against you or your business.Never try to do everything yourself unless you have the talent.  

What type of insurance should I carry?

Do I have a attitude, you bet, can't collect from them when they default and 80% will be a problem guaranteed.The vast majority on welfare of any type in Ontario are scammers stealing tax dollars and all believe they deserve every cent they receive.

Most leases, landlord needs to approve any type of subleasing or lease assignment.

Do you know what type of investing you want to do?

@Andrew R. the NRW 91-01: Withholding on Sale of Real Property by Nonresidents is a good link - I went to bookmark it and found I had already done so in 2012 :)My understanding is that it's "withholding" meaning the seller may get some or all of it back once s/he/they file a tax return in Rhode Island for that year.Also a close reading mentions a possible exemption for sellers 55+"In the event that the sale of the property by a nonresident will not be subject to tax under Sections 121 (One-Time Exclusion - Over 55 Principal Residents)... the nonresident seller must make the gain election and file the RI Form 71.3 Election even though no withholding need be made""If the property Martha was selling was her residence and if she otherwise qualified and intends to treat the sale under Section 121 of the Internal Revenue Code (one Time Exclusion Over 55 Principal Residence), she would still have to file the election form 20 days before the closing but would complete the election form and use the special types of transactions area on the back.

also recorded more then on county records comes up on trulia and all websites when you type address in on google

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and yes if the buyer wanted this property.. the second they got the counter and if it was acceptable they should have signed it.. then get it acknowledged and then they are in escrow... if they wanted out I am sure there was a due diligence period.. this is the type of mistake folks only make once its a learning curve however the buyers agent should have told the buyer they risk losing it by sitting on the contract to the very last second. this is why in hot markets you see sellers and buyers make offers with ONLY hours to repond.. offer comes in at 1pm and they require a response by 5pm.. giving days to respond is nice but it does set you up for what exactly happened

Have you selected a type of investment?