I am still working, not needing monthly income, do you think it is ok to propose change the term to receive one payment at the end of the 5 years (say the 90% principle plus the interests compound yearly)?

I’ve already took a 60hr course on Real Estate Principles so I kinda already know the terms and a little bit of the laws .

I understand that you can include the assignment fee in the principle price in a contract but when can a profitable buy high assignment fee be a problem for a seller or end buyer?

proper notice to enter is usually defined by the state as 24 hours notice. some states require 48. that is your starting point. that being said, coming through with a high amount of showings can be considered as disrupting the tenants right to peaceful enjoyment of their home. if you plan on coming through with one or two, you should be ok (legally) to give tenant prior written notice and come in regardless of their objections. if you think it may take multiple showings, you are likely better off to work with the tenant to set up a block of time for an open house. in extreme situations, you can consider offering a gift card to a local restaurant or movie theater to get them out. the tricky part is striking a balance between what is legal, entering with proper notice, and what is fair and reasonable, since the tenant can purposely leave the house an extreme mess to make it harder to re-rent, badmouth you to potential renters, and may even try to refuse entry. how you approach will depend on your relationship with tenant.

There is a property in foreclosure in my town that I'm interested in, but I'm confused about a couple things:1) How do you answer the objection from the seller who says their credit is already ruined because of missing so many mortgage payments? 

Not sure but I guess I have to focus on one objective and go after it, but help the homeowner out too and get them the benefits of staying and the benefits of leave.

How is this logical and what is the principle behind this?

Your structure depends on your investors so it's important for you to understand what your investors goals, objectives, and expectations are.If you'd like some more information on this topic, it just so happens that my business partner and I recently did a talk titled 'How to Raise Private Money...Magnetically'.

Most mortgage have little affect on principle in the first 10 yrs, so compare that to the estimated current value. 

@Abena Cannady Yes, an inspection contingency is normal, typically 5-10 days so 3 days should not cause objections.