Going by your post, I would do lots and lots more reading before thinking about investing!
Looking at possible 4 or 5 houses-what deposit, total costs would that be aproximately? Too many variables. It depends on how much the property is worth, what deposit you want to put in, any repairs required, etc.... You won't need to put in a deposit if you source out a BMV property and do a NMD deal.
Once the first one is bought how do I fund the next and the next and so on! Keep reading the BMV section and you won't need any cash to fund the next one.
I think it would be 15% of the price as a deposit for a start or is that worse now with the credit crunch tightening? 85% LTV mortgages are still available.
Ofcourse BMV would be good. Definately! If you purchase a property for £70k which it's MV is £100k and take out a 75% LTV mortgage (£75k mortgage) with positive cashflow locked in a 5 year fix to ride out the blips (hopefully). However if the market in 5 years time is still poor and say your property is worth £90k, you could take out a 85% LTV mortgage which will give you £76.5k which pays off the 1st mortgage, lock this in for a long term also and hopefully in 5 years time your property will be worth much more. Off course it all depends on your individual strategy, current market conditions and what levels of risk your willing to take!
Hope this helps.
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