New greenhouse grow

Hello everyone I'm thinking about doing a greenhouse grow this year in pots not straight inti soil please could somebody give me some advice on the following questions thank you in advance 1. How long should I keep seedlings inside before putting them in the green house 2. What month should input them outside in my greenhouse 3. Tough good yielding outdoor strains for uk weather climate thank you

1 and 2 are same, as soon as days at longer than 13 if you are not supplementing light, and after last hard freeze would be a good guess, we can't predict your plants or skill level, which this dependant on

Start them about 2 months before whenever your summer solstice is, put them out in the green house at about 3 weeks old. Summer solistace = 12/12 light cycle which will begin the flowering stage.

i have never used a green house just writing what I would do if I did, to sort of simulate my indoor environment.

Stay away from tropical strains and hazes for your first grow. get something easy like bubbleicious, if your buying from a seed bank they usually warn you if it is hard to grow.