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The only bit I can offere insight in would be the inquiries. I will preface this with it is just my knowledge and may not be fully accurate.
From my understanding 1-2 is ok unless it is done within a quick time frame like a month or so then it looks like you are shopping around type thing. So if you talk to a couple of different LO within a couple weeks and each will generally pull your credit report to look at the scores to run the numbers for you. As for how long they can affect your credit score, I believe 12 months but I want to say after a certain point during that time frame it starts to lose effect.