Right, based on my experience of going to Anfield for 53 years now (and an ever-present so far this season - although I don't do friendlies so I won't be at that one), my perfected routine is to park on Richmond Park. Put it in to your GPS. It isn't a park but a street in L7, have a look at it on Google Earth. There's a 2/3rd mile residents-only parking zone around the ground so if you get any nearer than Richmond Park, you will have to pay on a controlled parking zone but my philosophy is never to pay or I'd have to do it every week so I won't. Also, ignore all the 'official'-looking blerts trying to wave you in to a dodgy looking back street and give them £5-£10 for the privilege.
Also ignore the Commodores (once, twice, three times a season etc) on here telling you kids will come up expecting money. On that street, they will not so ignore all that nonsense. Then you've got three pubs en-route to the ground. The Cabbage is a good one and despite it being packed, you'll get served pretty quickly. The Flat Iron is a bit wool for me so I avoid that and then you've got the Arkles which again is alright but crowded and more difficult to get to the bar. Don't pay for any food or drink inside the ground unless you earn Premier players wages and whatever you do, outside the ground DO NOT UNDER ANY CIRCUMSTANCES CONSIDER BUYING THE FILTH THEY SELL AT 'STREET FOOD' because that pretty well describes the poison they try and fob off on you.
If you need any further info, PM me and I'll answer any queries you have.