Well right now profit have dropped and are still dropping, you would be lucky to make £8 per day with that setup if not paying for electricity, so would look at over a year to make the money that the setup has cost you back again. You might be better to just invest the money in some coins.
I have 6x 470 setup you could have for £2k 🤣
lol
This is a horrible time to build a "first" rig. I think this is why GPUs are finally back in stock. People are building that "first" rig and quickly realize that their 2,ooo.oo rig is only making 10.00 a day and that is quickly falling. While I don't overclock my 1070, I think with an oc Mike is about right. With 6 1070s you are going to be near 8.00-9.00 a day. That is a lot of days till you break even when you subtract electricity.
Here across the pond we have things like Craigslist and Facebook Marketplace where there is a market for used computer parts. If I was starting today, I would start with all used gear and get in as cheap as possible. On most newer boards you can run 4 cards.
You may want to investigate into used gear which will help you learn with less of an investment and a higher possibility of breaking even so you can start making money.