LEAN TO green house (Mosterton DT8)

I want to share plant growing With my granddaughter, could really do with a lean to greenhouse,( don't have the room for a full greenhouse) she is very keen to share the the experience, would like to get some seeds on the go a.s.a.p , any type of lean to would be good, but not keen on the polythene ones . Can you you help us please.