Posted: 11/02/2016 at 21:16
Hi, Catie, I've just had a tip-off that you need some help.......I would just say that the thread 'Sweet Pea Know How' mentioned by the guys, is located in the Potting Shed bit of the forum.
I've read your query and I'm very sorry to say that from the description of your homemade compost, it will be far too rich for sowing sweet pea seed....or, I venture to say any other seed. I would use it either as a potting compost or soil enricher.
Use a low nutrient seed compost such as John Innes seed or No1 compost for autumn sowing of sweet pea seed or (as Fairygirl does) multipurpose compost in the Spring.