Welcome to Just Answer and thanks for your question. The things to remember about moles is ABCD.
A = Asymmetry. Moles that are round are usually totally normal. Look out for those that change shape.
B = Border. Changes in shape around the edges should be watched for. Usually the borders are smooth and even.
C = Color. Smooth, even brown coloring is normal. Moles that have many different colors should be examined.
D = Diameter. If it's larger than a pencil eraser, it should be seen. Most moles are small (and remain that way), smaller than about 5-6 mm.
It's a great idea to have a periodic skin check, especially given your history or sun exposure and tanning beds. It doesn't sound like your moles are anything to be concerned about though.