Buying shares (complete newbie)

Evening guys

Having recently paid off our mortgage we are now looking to make some investments in the stock market and am looking for some newbie advice.

I have been doing some reading on possible up coming IPO's and am interested in investing when they come up

Snapchat
Pure gym
Pinterest
Uber

Also looked at Amazon, Tencent and Alababa (Baba)

At them moment we have about £10k saved and I want to invest the lot and then start buying between £500 - £1000 shares every month or 2

Can anyone offer advice on an online Brooker and any other thoughts on the above

Thsee shares would be a long term investment rather than day or short term trades

Thanks in advance

Buying shares (complete newbie)