I dont know about the security in Venezuela nowadays. It has just been an election there that many think was rigged and many people are not happy with that and it could affect security in the country. You better do some more detailed research…

Gear for south-America - you must be prepared for both very hot and very cold weather. And very wet weather also. The far south of SA is quite cold even in the southern hemisphere summer. I rode into Ushuaia on christmas eve of 2016 in heavy sleet and 2-3 degrees above freezing. It took me several hours to thaw when I came to my hostel. And even though the weather improved the next days it didnt get 2-digit tempratures (celcius) when I was there. A lot of south America is also at quite high altitudes where it can get cold (large parts of Colombia, Equador, Peru, Bolivia, northern parts of Argentina and Chile lies at high altitudes) So gear for all seasons, layers, rain suit etc are mandatory as I see it.

Motorbike security - yes always find accomodation with safe parking or if no safe parking availabe check out if there are a «estacionemento» guarded/locked parking lot nearby. You have to pay a little but its usually not much and in general only peanuts for westerners. And very nice for piece of mind. These parkings are ubiquitos and almost everywhere in south-America. I guess a disc lock with alarm is nice to have too, but could piss off some night watchmen trying to fit in another vehicle in the safe parking area.

Learn some spanish as well. Even though it isnt a whole lot - locals will appriciate your effort.

Personally I carried some food with me - as for breakfast. Oatmeal/cereal, grained bread, some fruits, jam, instant coffee, teabags etc - so that I could have breakfast readily available in the morning, even when staying in a hotel, guesthouse, hostel, Airbnb. So that I avoided starting the day hunting for breakfast and sometimes starting riding on an empty stomach.

Have a great trip - you will learn and adapt as you go. You dont have to bring all things to south-America, most things can be purchased there.

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In the end everything will be fine. If its not fine its not the end....