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You'll need a beam of some sort to substitute for the load bearing wall and a support post at each end. If it's fairly short (8-10'), you can probably header it with a 4x, otherwise a glulam beam or steel wideflange would probably be required for long lengths. With large spans the support posts would require a concrete pad footing with size dependent upon bearing load and soil conditions. Sounds like a fairly simple alteration, and simplest is to contract with a local architect that is also able to compute basic structural calculations, or hire a civil engineer (structural) to do the design work. Total costs can be anywhere between $6k to $10k.
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