Avoid the weed and feed products if you can. fertilizing weeds is just a waste of money. I use the crabgrass preventer when soil temps hit 50s for 3 days in a row. You can get a temperature estimate on this
website
crabgrass preventer needs a moderate rain (1/2 inch) to wash it into the soil to create the weed barrier for new seedlings. Be aware that once you've applied crabgrass preventer, you should avoid digging holes in the lawn because it will disrupt the weed barrier.
spot treat the broadleaf weeds with some kind of spray that you mix with water that has multipage warnings on the bottle. This needs a day or two of dry weather to soak in to the plants. After a few days you can tell the weed killer is working when the weeds get twisty
After the grass starts growing, you can start applying your fertilizer but you'll need to keep spot treating the broadleaf weeds that popup though the growing season.
Note: a little epsom salt on the lawn and on the plants can't hurt. it helps with chlorophyll production and also helps with fertilizer uptake.
Get a soil sample and bring it to your cooperative extension for testing to make sure you don't have anything weird going on with your soil.