My garden is about 30 ft long x 20 ft - with a garage and a path down
the west facing side. I never know what to do with it - I'm retired
now and heavy work is getting hard. Should I get a landscape gardener
in just to sort things out - how much will it cost - or I was going
to find some agricultural college student/s to give me some advice.
What do you think?
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You don't say where you are. Cost of advice/plans/drawings. etc. all depends
on the skill of the person giving the advice, where you live in the country
(local economics), supply/demand, etc. If you're in N. London I'd be happy to
give you some advice for little if any remuneration (money).

Basically, if you just get a sketch done, it's going to cost less than a
'proper' drawing, which in turn will be less than a coloured drawing.
Isometric (and other fancy views) of your planned garden will also cost more.

If you need any more advice, just mail me.

Dave.