First allotment! Looking for tips and advice

[u/Sufficient_Raisin_65]

I’ve just got my first allotment with my partner and we’re really looking forward to getting started! These are a few photos of the plot as it currently stands with the boundaries in red - the plot is 3.75 rods. (Photos 2 and 3 are taken from the same spot, looking left and right).
It already has a few established fruit trees (which look to all be apple trees) and raspberry/black raspberry canes, as well as a two small algae filled ponds and what looks to be a hedgehog house.
There’s definitely some tidying up to do, but I’m hoping to keep as much of the existing character and wildlife as possible rather than completely starting from scratch.
I’m thinking of growing Tomatoes, Potatoes, Strawberries, Onions for example.
We’ve got a conservatory at home, so I can start seeds off there, and I’m hoping to get down to the plot roughly twice a week during the growing season as it’s a five minute walk from the house.
I’d love to hear any tips or advice, particularly what I should tackle first on a plot like this and are there any obvious jobs I should prioritise before next spring? I’m also looking to get two compost bins - where would be the best position for these?
Thanks in advance!