If its was me, drain oil without running it.....add new cheap stuff and new filter.
Then disconnect electric/leads and turn over on starter for a few mins......
remember after 4-5 years the oil will be knackered and will have totally drained out all pipes to the bottom, therefore there could be rust in place there should not be.. If you thrash it on first start with oil drained and rusty internals then could seize/go bang and would be expensive car after all.
Would then run on cheap oil for a few 100 and change for decent stuff.
Would also change water, no anti freeze at first then drain after few 100 miles. then change with correct amount of anti-freeze this time.
IF its been under covers for this time check for rust all over including break lines. (if they are dead then will get picked up on MOT anyway)
Change tyres even if they look good, the tyre wall will be knacked/stressed and if you take on track might be very costly lesson.