I use a folding launching trolley with a selections of sibs, including a HonWave T32. It works really well, and I find it easier than buying or swapping transom wheels every time I change the boat (Which is a lot
). Make sure you choose one that is long enough for your sib.
A lot of your other questions depend on which slipway you are using, they are all different. Slipway etiquette is important, make sure you get on and off as quick as you can, messing about on the slipway stopping others from launching or recovering drives people mad.
1. Prep the boat fully before you go near the slip, put the engine on and load all your gear.
2. Roll the boat down the slipway and hold on to the bow line, keep going until the boat floats off the trailer. Pull the boat back to the slipway and leave there till you get rid of the trailer (as quickly as possible).
3. Go out and enjoy yourself
A couple of things since you seem to be quite new this, a little training goes a long way on the sea. Pick a sheltered area to practice and make sure you have all the basic safety gear. Things change quickly on the sea so check the the forecast carefully.
If you tell us which slipway you plan to use I'm sure someone will give you local info about landing stages , pontoons or ladders you can use.