Well Andrew some of us are not on holidays so here goes...
Forget F/Ford Avons,get yourself a set of Yokys or Toyo 13" as you will find at some events where vehicles compete as registered cars they require a road legal tyre to comply so the legal semi slicks are the go plus they work better anyway.
Bonnet: As a scrutineer i've seen dozens of ways without using bonnet pins,a cut up belt from your old mans wardrobe,a seatbelt,a chain,even a length of rope(looks ordinary but legal)just remember not to use an occy strap as the restraint must be firm and rigid and not give.
Tow Hooks:Again an easy way is to get hold of an old lap belt and do it up around the caster rod then a zip tie round the bumper to hold it up,same at the back around the shackle and zip tie the the bumperette,use a very weak zip tie so it will break when(if)it ever gets towed.Option 2 is fabricate and weld on permanent ones.
Triangle:Walk into any signshop and ask them for a piece of light blue vinyl<it needs to have 6" sides,cut it out and stick it on the bonnet over the top of where the battery is located(assuming it is under the bonnet)magnetic triangles strictly speaking are not legal as they can blow off,if any one presents one to me i have them tape the edges before they are allowed to continue so you may as well do it properley the first time.Also make sure your Positive battery terminal is covered with something to stop any arking.No holes in the firewall,2 return springs on carbys,2 litre catch can,a can to catch any coolant from overflow if its not a sealed recovery system,tailshaft strap.
Head lights: Just do a couple of crosses with some insulation tape,Fire Extinguisher:must be a metal frame and BOLTED in,technically must be reachable whilst straped in but this is usually not feasable so as close as you can get it,one of these things can kill you in a big prang if it becomes a missile due to pussy mounting,so think it through.
As far as clubs go as has been stated hit the cams manual,but if it's hillclimbs you want i'd likely join a club that operates on of the states hillclimb venues like Gippsland.Once you join all you will need is a level 2s license and on that you can do anything except full circuit racing.