The green beans & cukes are best sown direct & not indoors. Tomatoes & peppers take 8-10 weeks to be large enough to set out. & neither likes cool evenings much less frost.SO>>> figure when you can set them out & count back 10 weeks.

Call your county Cooperative Extension Office or check the web for your county Master Gardener group - they can help provide the last expected frost date range for your area and recommended vegetable variety list.

In my zone 8b, peppers like more heat than tomatoes so I start those seeds about 2 weeks later than my tomatoes. I use 6 packs planting 3 seeds per cell thinning to the strongest as they grow on and bumping up as needed before planting outside.

Tomatoes can be bumped up into larger pots (community pot > deep 4" or deep coffee [plastic or paper] cups > 1 gal - set deeper each time to encourage more root development before setting them out in garden or giving them to gardening friends!

I have an indoor seed starting arrangement made from metal shelves, each with 2 stoplight fixtures equipped with daylight spectrum bulbs or 1 warm & 1 cool bulb (set about 3 inches above seedlings and left on for 14-16 hours daily) and seedling heat mats with thermostats to control soil temperatures. After the seeds emerge I remove the clear plastic dome and turn on my small circulating fan for an hour daily to provide air movement which strengthens seedlingÂs stems; as seedlings grow on I bump them up to individual pots at the 2 true leaf stage, start ¼ strength liquid balanced fertilizer, lower the soil temperature and keep raising the lights to maintain proper distance. Be sure to label each pot or youÂll loose track of varieties.
Take pictures and keep notebook of what, when, where so you can make adjustments in the future.

Note: All seedlings need to be hardened off over 7-8 days before finally planting out in the garden  less transplant shock that way! Tomatoes only can be planted deeply leaving 2 sets of leaves above ground; in no time youÂll have big, healthy plants and early tomatoes provided you keep soil moisture even and drench soil with Epsom salts (2 T./gal) to keep blossom end rot at bay provided itÂs a problem in your garden!

Beans and cucumbers are easily started in the garden after soil has warmed a bit  they hate cold wet soils.

Happy Gardening!

TJ