Hi Carly and welcome to COL
Congratulations on your new puppy - I am sure you will have lots of fun with him
We got our Bella 9 days ago and I can tell you that you will have lots of fun and he's sure to make you laugh quite a bit but there will also be times you are pulling your hair out
so I would also recommend the good puppy book or the k.i.s.s. puppy book, both are very helpful and will answer most of the questions you will have.
On the questions you asked -
1.how soon after bo has eaten do we take him out to "relieve" himself? - straight away!! I can't stress this enough, do not wait even half a minute, as soon as he's finished eating get him outside. This also applies to the minute they wake up, straight outside.
2.how will i know when to cut his feeds down to 3 or 4 he is currently on 5 a day 6.30am then 10am then 2pm then 6pm then 10pm? - follow the diet sheet the breeder gives you but I would think he should be on 4 meals at 8 weeks old, we feed Bella at 7am, 12noon, 4pm and 9pm, she was having puppy porridge/meat & complete biscuits/scrambled egg/meat & complete biscuits but we've gradually cut the other bits out so she's now just on the complete food.
3.how long do i keep gving him his puppy milk for he currently has it in the morning then again with his tea? - again follow the diet sheet but I personally would be gradually reducing this and then cutting it out feeding pup a complete food.
4.if i cut out the 10am feed will he be ok just having the milk until his lunchtime feed? - I don't think so, Bella loves her food and I don't think she'd go until 2pm with just having milk. Rather than just cutting out the 10am feed I'd be inclined to adjust the four times accordingly so they're evenly spaced.
Only other thing I would say is if you haven't already got a crate, get one. I know some of them are quite expensive but they are an absolute godsend. I didn't like the idea before we got Bella but it has proved invaluable and she loves it too