My oldest is starting kindergarten this year. He is a very picky eater and I am worried about him eating lunch at school? I will send his lunch I guess just a peanut butter sandwich. We don't cater to his pickyness at home,but I want him to eat something at school. Does anybody have lunch suggestions or advice on getting in a school routine?

Since he'll just be starting school, I would say pack him whatever makes him feel comfortable and secure at school. My kids are creatures of habit and don't mind eating hte same thing everyday anyway.
I will also throw my two cents in about school lunch. We don't eat meat at home and eat pretty healthy (organics and not much sugar, etc.), so when my son asked to eat lunch "on the tray" at school I said all right and figured it would be ok. Alabama supposedly doesn't serve fried foods anymore in schools, etc., according to the state board of ed. Anyway, high cholesterol runs in my husband's family, so my kids get checked at age 3 and again at 6. My son's was fine at 3 and at 6 1/2 was high. Long story short, we went to a nutristionist who instructed him to eat lunch at school no more than once a week (she's convinced that school lunches are still not what they purport to be and that while they say the chicken strips and the like aren't fried that they are in fact par friend and then frozen and baked at school, so that they are still jam packed with saturated (and possibly trans) fats and other unhealthy ingredients. So he stopped eating school lunch all together, with a few other minor changes in his diet, but since we were already eating so healthfully at home those other changes were very small. At his re-check 9 months or so later, his total cholesterol is down 20% and the "bad" (LDL) cholesterol is down almost 25%.
Sorry for the ridiculously long reply to your post, but my point is that anything you pack from home is likely to be much healthier than the school lunch option, even if it's boring and redundant.

Another thing -- I don't know how picky your son is, but it is not unheard of to get a letter sent home that you can't have peanuts, peanut butter, etc. in a particular classroom because a child has an allergy. So, if the only thing your son currently eats that would make a good, packable lunch is peanut butter sandwiches, you may want to spend some time this summer "practicing" other lunch options.

(I say this not to be alarmist, but because I had a girlfriend who had this happen to her! It was tramuatic for her daughter to not be able to have her daily PBJ, and it took them a good while to find an "okay" substitute that didn't get thrown away in the lunchroom trash each day.)

Boston Girl has a good point, because we ran into this problem with my oldest LO when he started school. There was another student in the class that was allergic to peanuts and the teacher sent a letter home asking the parent's not to send anything to school that contained peanuts or peanut oil. My LO is not a picky eater so it was easy to find him something else to take for lunch, PBJ's are just his favorite.

Thanks for the reminder about peanut allergies! I will find something else to have him practice eating for the next few weeks. LawMommy I agree about school lunches as a former teacher I ate lots of them when I was preggo with my 1st and I think that is why I gained so much weight because when i stopped eating them my weight didn't increase so much. I have been out of the schools for three years and how quickly I forget things when I am trying to keep up with three little ones.