Seeds

That is a big list!

All I can say is to get organised, I use a spreadsheet but a pen and paper is just as good to group together those seeds with similar germination requirements (light & heat). Then plan when you have to get them sown. You don't need to do them all at once. You can sow successively over a month or two at this time of year using one or two propagators. So you'll be first of all sowing those that need starting in Feb/March.

Also some veggies you can sow successively over the season, so for instance sow half a dozen lettuce seeds now, then repeat in a months time, etc, etc. That give you a few lettuces over the whole season rather than a glut all at once.

Once they germinate you can move them out (pricking out), which means transplanting the seedlings into bigger trays or pots. The more hardy stuff like lettuce and spinach can then go straight outside into the greenhouse for a few more weeks before you harden them off and plant in their final positions.

The tender ones (like pumpkin) will need to be kept in your house, so delay sowing these until late April/early May when the weather is improving and there wil be little risk in them getting cold when they need to go outdoors.

I tend to start most of my seeds in pots in a propagator, but some seedlings dislike transplanting, in your list all I can see are carrots that prefer direct sowing in the soil.

Get a quality seed compost (like Westlands John Innes Seed Compost), get some seed sowing modules and keep everything clean. Write out labels with the variety and sowing date and stick these in your pots before you sow. I usually prepare everything first then sow at the end with clean hands so I don't risk mixing up seeds.

Of course you also need to plan the space for your final planting, pumpkins need a lot of room for example.

Well sorry if this all sounds a bit basic, they are all from mistakes I made in the past It sounds fun though and I enjoy the planning almost as much as the eating when it comes to veg. There will be a bit of hard work inbetween too