What I did is researched every vaccinne individually (all product inserts are available from the Canadian manufacturers website - google for example, "Tetanus Vaccine Manufacturer Canada", you can usually find out what vaccine is used in Canada (or ask Public Health or your doctor") then google that vaccine and you will find the manufacturer, then go to the product monograph or prescribing information and you can find info on the vaccine.
Then, go to American, Canadian and British Medical journals (available free on line) and also the Statistics Canada website, where you can find the raw data on numbers of cases of each disease, what age group (most deaths/complications are in premies, those with autoimmune disorders etc.), look at the straight numbers of cases, age groups, etc. and then decide on each vaccine which you even want to do to start with, and then you will have a sense for how long "immunity" takes and make your decision from there based on the age of your child.
For example, once I learned more about Tetanus, and that there has never been a single recorded case of Tetanus in a child in Canada, (because children generally have good blood circulation and bleeding causes Tetanus to be a non-issue...much more I could go in to there...) I decided not to vax for tetanus.
Once I learned the odds of getting very sick or dying from each of the diseases, and what the risk factors were and that my kids had none, we decided not to vax at all. The only one I would have considered is Whooping Cough/Pertussis, but at the time, it may have changed - it took several courses to attain immunity, but by the time immunity was reached (18 months I think?) the risk period had elapsed (risk reduced significantly around 12 months I think?) we decided no point in that one either.
There is also a table availble, if you can still find it, Statistics Canada had it up for years but may have removed it, that shows that the rate of decline was the same BEFORE vaccines as it was after, (in fact, ther were may peaks even after certain vaccines were introduced). It showed each disease, number of cases, date vaccine was introduced and you can see on the graph how vaccines actually made little difference. Most cases for vaccine will show you a chart with a rate of decline starting AT the point of vaccine introduction, but they dont' show you the "before vaccine" decline was the same as the "after" so not attributable to vaccines.
And the more I researched the more I became convinced that vaccines don't actually work. They used to use live vaccines, which made sense - the body naturally becomes immune to those diseases once we've contracted them so if we contract them via vaccine, we then get a mild case of it and become immune. But after they found that all polio cases in recent years were actually being causes BY the polio vaccine, they started using dead vaccines. So now all vaccines are dead ones. I've never been able to find a logical, rational convincing explanation for how you get immunity from a dead cell. Wouldn't we all be immune them from touching doorhandles with dead viruses, that were recently sprayed with Lysol? LOL Okay, I'm over simplifying on that one, but my point is the more I researched, the more I am convinced that today's vaccines very likely do not even work.
Not to sway you and I know you want to vaccinate, but I think it is helpful to actually research each disease and each vaccine and decide which you wan to do and when based on your child's health, age, risk periods, when they'd reach immunity etc. Also, once your child is older (I think it is 8+?) you can get single vaccines, you don't have to get the combos anymore. FYI.
Good luck in your decision.