[cdavis]

Hi Kristian,

Welcome to DB. I'll try to answer a few questions.

Yes, take the wetsuit, even in warm water, a little bit of protection is good.

Weights, take 6 lbs (3 kg), including at least one .5 kg weight. That will be more than adequate and you can take some off the belt as needed.

Weighting will depend on what you are doing. I've assumed relatively shallow. Weight to be neutral in the water at or (usually) above the level you want to spend time. For example, I weight to be neutral at 33 ft (10m) if diving 60 ft or deeper and not spending a lot of time on the bottom. If I plan to be spearing in 30 ft, more weight is needed, neutral at 20 ft is about right. It depends on what you are doing. Try it and weight what seems comfortable; erring on the side of being too light is a good idea.

You don't need a freediving computer, although they are Very nice. I love my D3. A watch is handy but not required.

You have gained enough skill that diving with a trained buddy is VERY NECESSARY unless you are being consciously proactive about not pushing your limits. The truth is, when freediving, there is always a small possibility of having a problem, not just limited to B0, where a buddy will save your life. If you are pushing, especially at your level, that possibility is not so small. That said, the truth is that many divers dive alone. Some recognize the dangers and some don't. If I was in your shoes, I'd work hard to find a buddy, but dive anyway if I couldn't find one, being very, very careful about pushing in any shape or form. Recognize that some people have gotten in serious trouble, as in they BOed, without thinking they were anywhere near their limits. You could be one of those people.
Oh yes, a "trained buddy" is someone who knows proper rescue techniques. Joe Blow, who doesn't know to get the mask of an BO victim, might not be much help. Trying to buddy with scuba divers is pretty worthless from a safety point of view