:idea: Take a look at the newbies guide in teh low carb forum.
:idea: Buy a carb counting book.
:idea: Learn to read labels - the carb content
If you are worried about low carb food costing more, go visit your local street market.
if it is labeled as low fat, I'd give it a wide birth and don't buy things with more than 10g carb
leafy green salads are okay as are mushrooms, aubergine, courgette, broccoli, cauliflower, cabbage, cucumber etc Most veg are low enough to be very good for your low carb diet. Ever so slightly higher are tomato, onions, peppers etc
berries - strawberries, blueberries and rasperries - are much lower carb than most other fruits and often you can get a good deal on frozen berries - I put them in to Lidl greek yoghurt and the frozen berries swirl around in a much more attractive and colourful way than fresh.
cooking affects how much available carb there is - I only eat raw carrot now, not cooked anymore
most cheese is less than 1g carb per hundred
double cream is better than single cream for carbs
And yes eggs are fine
I'm a vegetarian so won't be advising you on meat and fish