I`m in the process of investing in the buy to let property rental market.
My advice is to talk to as many people as you can who are doing what you want to do, always over estimate your costs and make sure each property you decide in is surveyed thoroughly and be prepared to walk away even though you may have invested some time and money in your research.
Let me know if you want to correspond more as I have some real lfe sample drafts of cash flows which I am currently working on and business plan which you could crib from.
I am spreading my portfolio with some student rentals, some young professional and some holiday short term lettings in differing lcations.
I`m working on breaking even on costs for 2 years, and looker at the longer term game in terms of equity growth over 12 - 15 years as a pension fund with strategies for removing money being in terms of re-mortages when equity has increased and rental covers increased borrowings.
I am looking at interest only mortgages over 15 years with selling some of my potfoio at the end of that period to pay off the mortgages and retaining those that will give me the highest cash income when I retire
Also get a good accountant, tax adviser, legal adviser and real estate agent and talk to them lots. Be specific with your needs as this will help them. Also any professional help you engage try to get people who also invest in property as they will understand your needs better