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You get lot of guidelines in net, but still I will try if I can help you out.
Just follow the below steps.
1. Decide if the given board size is feasible for placement.
2. Place the Mechanical components and fixed components e.g connectors, etc.
3. Start with placement of IC. (Take care of SI analysis)
4. Completed placement of power section.
5. Continue with discrete placement and complete placement.
Components are placed following the customer's input on any fixed locations and suggested placement guidelines. The first goal is to optimize the critical signals and secondly to provide the best overall routing flow. The customer will be given a set of plots showing the board dimensions, components with fixed placement, component pin outs, and hole sizes. This information should be checked carefully. Plots showing a complete placement will typically come later and the placement will be reviewed and modified as needed to meet all spacing, height, and routing requirements. The customer is asked to approve the placement before routing begins as any changes to the net list or placement after this time could be very difficult to incorporate and may cause adjustments to the turn time for the design.
Beside that also check the links underneath and go to page 9 & page 20 for later,it gives you some idea....
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