Which Air Pump And Stones

I'm planning to set up my 175 litre tank this weekend and would like to add an air stone for the bubble effect - I believe it also has beneficial properties, so much to learn.  I understand I need an air pump for this and would like some recommendations for something priced middle of the road, bearing in mind I have already spent the rest of the years pension buying the tank  also, what sort of stone.  I don't want bubbles in a line.

Please excuse non technical terms as I'm a complete newbie who's now worried she's not up to the job
Thank you in advance.
I'm so glad I found this site.  so much information to be found

I always recommend the Interpet Nano Aquamini Aquarium Air Pump.  It's not going to provide much air, but it is literally almost silent (bubbles breaking on surface make more noise) and it is super cheap. In fact on the Amazon page for this product at the moment there is a very good offer for this pump plus a couple of hairstyles and quite check valve and tubing all for less than £20.  You may also like to consider a line splitter so you can have 2 or more small patches of bubbles rather than one large one.

Hairstyles - indeed.