starting 1989 Pro 50 first time in two years

[chucktown]

Picked up 1989 Yamaha Pro50 that hadn't been started for 2 years sitting out side.
I'm a rookie Boater but this is what I think I should do.

1. empty fuel container and re fill with fresh gas. Should I clean out container or flush it with ;aquer thinner or something to get varnish out? pURGE BLUB AND FUEL LINES OF OLD GAS.

2. put new plugs in.
3. new gass filter
4 Empty Oil reservior and replace it ( With what type of oil?)
5.remove screw from bottom of carb bowl and spray in sea foam cleaner.
6. spraY SEAFOAM CLEANER INTO CARBS.
aNY SUGGESTIONS ? AM i DOING THIS RIGHT?

[boats.net]

Probably need to remove and clean carbs, put oil in gas until can check oil injection system is working ok.