cold start, prime bulb, turn key over with key pushed in till it hits, repeat process without pushing in key, if it doesn't hit, hold key in till it does. Normally its should fire up and idle, you may have to bump the key in a couple time till it gets warm enough to idle. You shouldn't have to raise the warm up lever unless you've flooded it. You may need to do a sync and lync on the carb linkages. These a fitting on one head with a hose to it, second port is open. it should be closed between the ports when cold, after it warms up, it should be open and allow air thru the port. check it
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