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Depends what your fishing for at the end of the day but a 9ft 6-8wt should be perfect. Bigger flies and stronger wind = heavier weight line. Travel rods make commuting to fishing spots via bike so much easier, and shakespeare make cheapish travel fly rods, but at the end of the day just use what you've got.
https://www.ebay.co.uk/itm/SHAKESPEARE-NEW-AGILITY2-EXP-7-PIECE-TRAVEL-FLY-FISHING-ROD-TUBE-/372309393181?var=Trick with any sort of casting is mostly timing, watch your fly line to make sure its properly unfurling behind you. With regards to wading, in the summer, the easiest thing to do is just go in shorts and use a battered pair of trainers. Tide times, time of day and weather have a massive effect, and if by trying to cast five extra metres means it ends in a heap you're not going to catch anything.
Could go smaller but cost goes up as going from a 9'6" 4pce to actual travel rods in 7pce is ££
Plan is sort out how to use the damn thing. Small selection of flies/ammo and basic bits that should all fit in the case.
I kind of understand why most images of fly fishing involves someone standing in deep water.... because of the limited range, so get wading.