Soil is low? I have a strip going on for 20 feet long, nearly 2...

I have a strip going on for 20 feet long, nearly 2 feet general where my flowers and shrubbery grow. Yesterday, I mind a bulb on top of the soil and I notice that there are spots where on earth the soil is very low. My cross-question is, what should I use to fill within these spots? Can I just spread potting soil? Will I necessitate to fertilize the soil? After I add soil, how long should I skulk before I plant anything contained by that area? I enjoy begonias in that nouns and I need to attach more. I do appreciate any and all tips/advice.
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Answers:    Potting soil,used compost,top soil ,woodbark or leafmould will adjectives serve to level the soil.Scatter Growmore granular fertiliser at 2 oz; to the sq;yd; and rake surrounded by lightly.
By the time it's reheat enough to plant out begonias,the soil should hold settled.
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You can buy compost or potting soil with fertilizer already surrounded by it and have your soil and fertilizer within one. Some sewage treatment plants sell a fertilzer made from sludge and it is best for use on non-eating gardens close to yours (not for vegetables). It is cheap and very fertile. Place that and some mulch and afterwards put the plants through the mulch.