hi Newbie,
the general advice (which is very good) is to test first thing in the morning, before you eat. (The results then should be between 4 and 7 mmol/L according to the guidelines generally recognised.) Then, test one hour and two hours after each meal. The guidlines there are that you should be no more than 8.5 two hours after eating. Preferably lower.
If you do this strictly you would be testing a total of seven times a day. Personally I find this a bit "keen", but some people do it. When I was in my early testing phase I sometimes did five a day, varying which meals I tested on different days.
The reason for testing both one hour and two hours after is that some foods take longer to absorb, so that whereas normally your level will be highest about an hour after eating, occasionally you find that with some foods the two-hour reading may actually be higher, or as high, as the one-hour reading.
Personally I found reducing the amount of carbs (bread, rice, potato, pasta, breakfast cereal) made a huge difference, but there are no hard and fast rules in this game. Testing and writing down the results is an excellent approach, you'll learn a lot very quickly.