That's the type thing I use.

I'm not a great expert on specific combinations ratios are best, but I would use this type as long as it's approved for electronics work.

What is the diameter of the solder?

I like to use about 1/16 of an inch approx. maybe a little thinner. Melts fast.

Get some paste flux and a brush and clean the places you are going to solder with the tip of an exacto knife or something to get any surface grease off and rough it up ever so slightly so the solder sticks better.

Bro finally got to me. I thought it was a good thread. Probably ended now, at least for me.

Duffy