Welcome to the STD forum. I'll try to help.
Half the population has positive blood tests for HSV-1, just as you do. Most of those infections were acquired orally in childhood, and most such persons are asymptomatic. However, unless you can recall symptoms that suggest either oral or genital herpes (usually blisters or sores around the mouth or on the genitals), there is no way to know for certain where your infection was acquired. But if it's genital, probably it won't reappear anyway; here is the link to a recent thread that discusses this in detail:
http://www.medhelp.org/posts/STDs/Recently-diagnosed-with-Genital-Herpes-HSV1/show/969931
From your description, I cannot tell what the IgM test showed. But it's a meaningless test that in fact does not reliably tell whether an HSV infection is new or old. Your health care provider apparently does not understand this. We never do HSV IgM testing in my STD clinic; it is a useless test.
1) If you have never had symptoms, probably you never will. Statistically, it is more likely your infection is oral than genital.
2) Low risk for any kind of transmission, unless and until you have an overt herpes outbreak. Asymptomatic shedding is much less common for HSV-1 than HSV-2. If you have an oral outbreak, at that time, don't kiss your kids. Otherwise don't worry about transmission. You're just like half the poplulation.
3) It usually takes 4-6 weeks, but sometimes takes up to 4 months for the HSV-2 blood test to become positive.
4) Additional testing is unnecessary and would not be helpful. Your routine blood count results are irrelevant.
5,6) No precaustions are necessary unless and until you have an outbreak. Nobody can say the risk of transmission is zero, but you're just like half the population in that uncertainty. The odds you'll ever infect anybody are very low. You really should not let this worry you in the least.
Regards-- HHH, MD